// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <stddef.h>
#include <stdint.h>

#include <algorithm>
#include <fstream>
#include <set>
#include <utility>
#include <vector>

#include "base/base_paths.h"
#include "base/environment.h"
#include "base/files/file_enumerator.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/files/scoped_temp_dir.h"
#include "base/macros.h"
#include "base/path_service.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/test/test_file_util.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/platform_test.h"

#if defined(OS_WIN)
#include "base/win/scoped_handle.h"
#include "base/win/windows_version.h"
#include <shellapi.h>
#include <shlobj.h>
#include <tchar.h>
#include <windows.h>
#include <winioctl.h>
#endif

#if defined(OS_POSIX)
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#endif

#if defined(OS_ANDROID)
#include "base/android/content_uri_utils.h"
#endif

// This macro helps avoid wrapped lines in the test structs.
#define FPL(x) FILE_PATH_LITERAL(x)

namespace base {

namespace {

// To test that NormalizeFilePath() deals with NTFS reparse points correctly,
// we need functions to create and delete reparse points.
#if defined(OS_WIN)
    typedef struct _REPARSE_DATA_BUFFER {
        ULONG ReparseTag;
        USHORT ReparseDataLength;
        USHORT Reserved;
        union {
            struct {
                USHORT SubstituteNameOffset;
                USHORT SubstituteNameLength;
                USHORT PrintNameOffset;
                USHORT PrintNameLength;
                ULONG Flags;
                WCHAR PathBuffer[1];
            } SymbolicLinkReparseBuffer;
            struct {
                USHORT SubstituteNameOffset;
                USHORT SubstituteNameLength;
                USHORT PrintNameOffset;
                USHORT PrintNameLength;
                WCHAR PathBuffer[1];
            } MountPointReparseBuffer;
            struct {
                UCHAR DataBuffer[1];
            } GenericReparseBuffer;
        };
    } REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;

    // Sets a reparse point. |source| will now point to |target|. Returns true if
    // the call succeeds, false otherwise.
    bool SetReparsePoint(HANDLE source, const FilePath& target_path)
    {
        std::wstring kPathPrefix = L"\\??\\";
        std::wstring target_str;
        // The juction will not work if the target path does not start with \??\ .
        if (kPathPrefix != target_path.value().substr(0, kPathPrefix.size()))
            target_str += kPathPrefix;
        target_str += target_path.value();
        const wchar_t* target = target_str.c_str();
        USHORT size_target = static_cast<USHORT>(wcslen(target)) * sizeof(target[0]);
        char buffer[2000] = { 0 };
        DWORD returned;

        REPARSE_DATA_BUFFER* data = reinterpret_cast<REPARSE_DATA_BUFFER*>(buffer);

        data->ReparseTag = 0xa0000003;
        memcpy(data->MountPointReparseBuffer.PathBuffer, target, size_target + 2);

        data->MountPointReparseBuffer.SubstituteNameLength = size_target;
        data->MountPointReparseBuffer.PrintNameOffset = size_target + 2;
        data->ReparseDataLength = size_target + 4 + 8;

        int data_size = data->ReparseDataLength + 8;

        if (!DeviceIoControl(source, FSCTL_SET_REPARSE_POINT, &buffer, data_size,
                NULL, 0, &returned, NULL)) {
            return false;
        }
        return true;
    }

    // Delete the reparse point referenced by |source|. Returns true if the call
    // succeeds, false otherwise.
    bool DeleteReparsePoint(HANDLE source)
    {
        DWORD returned;
        REPARSE_DATA_BUFFER data = { 0 };
        data.ReparseTag = 0xa0000003;
        if (!DeviceIoControl(source, FSCTL_DELETE_REPARSE_POINT, &data, 8, NULL, 0,
                &returned, NULL)) {
            return false;
        }
        return true;
    }

    // Manages a reparse point for a test.
    class ReparsePoint {
    public:
        // Creates a reparse point from |source| (an empty directory) to |target|.
        ReparsePoint(const FilePath& source, const FilePath& target)
        {
            dir_.Set(
                ::CreateFile(source.value().c_str(),
                    GENERIC_READ | GENERIC_WRITE,
                    FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
                    NULL,
                    OPEN_EXISTING,
                    FILE_FLAG_BACKUP_SEMANTICS, // Needed to open a directory.
                    NULL));
            created_ = dir_.IsValid() && SetReparsePoint(dir_.Get(), target);
        }

        ~ReparsePoint()
        {
            if (created_)
                DeleteReparsePoint(dir_.Get());
        }

        bool IsValid() { return created_; }

    private:
        win::ScopedHandle dir_;
        bool created_;
        DISALLOW_COPY_AND_ASSIGN(ReparsePoint);
    };

#endif

#if defined(OS_POSIX)
    // Provide a simple way to change the permissions bits on |path| in tests.
    // ASSERT failures will return, but not stop the test.  Caller should wrap
    // calls to this function in ASSERT_NO_FATAL_FAILURE().
    void ChangePosixFilePermissions(const FilePath& path,
        int mode_bits_to_set,
        int mode_bits_to_clear)
    {
        ASSERT_FALSE(mode_bits_to_set & mode_bits_to_clear)
            << "Can't set and clear the same bits.";

        int mode = 0;
        ASSERT_TRUE(GetPosixFilePermissions(path, &mode));
        mode |= mode_bits_to_set;
        mode &= ~mode_bits_to_clear;
        ASSERT_TRUE(SetPosixFilePermissions(path, mode));
    }
#endif // defined(OS_POSIX)

    const wchar_t bogus_content[] = L"I'm cannon fodder.";

    const int FILES_AND_DIRECTORIES = FileEnumerator::FILES | FileEnumerator::DIRECTORIES;

    // file_util winds up using autoreleased objects on the Mac, so this needs
    // to be a PlatformTest
    class FileUtilTest : public PlatformTest {
    protected:
        void SetUp() override
        {
            PlatformTest::SetUp();
            ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
        }

        ScopedTempDir temp_dir_;
    };

    // Collects all the results from the given file enumerator, and provides an
    // interface to query whether a given file is present.
    class FindResultCollector {
    public:
        explicit FindResultCollector(FileEnumerator* enumerator)
        {
            FilePath cur_file;
            while (!(cur_file = enumerator->Next()).value().empty()) {
                FilePath::StringType path = cur_file.value();
                // The file should not be returned twice.
                EXPECT_TRUE(files_.end() == files_.find(path))
                    << "Same file returned twice";

                // Save for later.
                files_.insert(path);
            }
        }

        // Returns true if the enumerator found the file.
        bool HasFile(const FilePath& file) const
        {
            return files_.find(file.value()) != files_.end();
        }

        int size()
        {
            return static_cast<int>(files_.size());
        }

    private:
        std::set<FilePath::StringType> files_;
    };

    // Simple function to dump some text into a new file.
    void CreateTextFile(const FilePath& filename,
        const std::wstring& contents)
    {
        std::wofstream file;
        file.open(filename.value().c_str());
        ASSERT_TRUE(file.is_open());
        file << contents;
        file.close();
    }

    // Simple function to take out some text from a file.
    std::wstring ReadTextFile(const FilePath& filename)
    {
        wchar_t contents[64];
        std::wifstream file;
        file.open(filename.value().c_str());
        EXPECT_TRUE(file.is_open());
        file.getline(contents, arraysize(contents));
        file.close();
        return std::wstring(contents);
    }

    TEST_F(FileUtilTest, FileAndDirectorySize)
    {
        // Create three files of 20, 30 and 3 chars (utf8). ComputeDirectorySize
        // should return 53 bytes.
        FilePath file_01 = temp_dir_.path().Append(FPL("The file 01.txt"));
        CreateTextFile(file_01, L"12345678901234567890");
        int64_t size_f1 = 0;
        ASSERT_TRUE(GetFileSize(file_01, &size_f1));
        EXPECT_EQ(20ll, size_f1);

        FilePath subdir_path = temp_dir_.path().Append(FPL("Level2"));
        CreateDirectory(subdir_path);

        FilePath file_02 = subdir_path.Append(FPL("The file 02.txt"));
        CreateTextFile(file_02, L"123456789012345678901234567890");
        int64_t size_f2 = 0;
        ASSERT_TRUE(GetFileSize(file_02, &size_f2));
        EXPECT_EQ(30ll, size_f2);

        FilePath subsubdir_path = subdir_path.Append(FPL("Level3"));
        CreateDirectory(subsubdir_path);

        FilePath file_03 = subsubdir_path.Append(FPL("The file 03.txt"));
        CreateTextFile(file_03, L"123");

        int64_t computed_size = ComputeDirectorySize(temp_dir_.path());
        EXPECT_EQ(size_f1 + size_f2 + 3, computed_size);
    }

    TEST_F(FileUtilTest, NormalizeFilePathBasic)
    {
        // Create a directory under the test dir.  Because we create it,
        // we know it is not a link.
        FilePath file_a_path = temp_dir_.path().Append(FPL("file_a"));
        FilePath dir_path = temp_dir_.path().Append(FPL("dir"));
        FilePath file_b_path = dir_path.Append(FPL("file_b"));
        CreateDirectory(dir_path);

        FilePath normalized_file_a_path, normalized_file_b_path;
        ASSERT_FALSE(PathExists(file_a_path));
        ASSERT_FALSE(NormalizeFilePath(file_a_path, &normalized_file_a_path))
            << "NormalizeFilePath() should fail on nonexistent paths.";

        CreateTextFile(file_a_path, bogus_content);
        ASSERT_TRUE(PathExists(file_a_path));
        ASSERT_TRUE(NormalizeFilePath(file_a_path, &normalized_file_a_path));

        CreateTextFile(file_b_path, bogus_content);
        ASSERT_TRUE(PathExists(file_b_path));
        ASSERT_TRUE(NormalizeFilePath(file_b_path, &normalized_file_b_path));

        // Beacuse this test created |dir_path|, we know it is not a link
        // or junction.  So, the real path of the directory holding file a
        // must be the parent of the path holding file b.
        ASSERT_TRUE(normalized_file_a_path.DirName()
                        .IsParent(normalized_file_b_path.DirName()));
    }

#if defined(OS_WIN)

    TEST_F(FileUtilTest, NormalizeFilePathReparsePoints)
    {
        // Build the following directory structure:
        //
        // temp_dir
        // |-> base_a
        // |   |-> sub_a
        // |       |-> file.txt
        // |       |-> long_name___... (Very long name.)
        // |           |-> sub_long
        // |              |-> deep.txt
        // |-> base_b
        //     |-> to_sub_a (reparse point to temp_dir\base_a\sub_a)
        //     |-> to_base_b (reparse point to temp_dir\base_b)
        //     |-> to_sub_long (reparse point to temp_dir\sub_a\long_name_\sub_long)

        FilePath base_a = temp_dir_.path().Append(FPL("base_a"));
#if defined(OS_WIN)
        // TEMP can have a lower case drive letter.
        string16 temp_base_a = base_a.value();
        ASSERT_FALSE(temp_base_a.empty());
        *temp_base_a.begin() = ToUpperASCII(*temp_base_a.begin());
        base_a = FilePath(temp_base_a);
#endif
        ASSERT_TRUE(CreateDirectory(base_a));

        FilePath sub_a = base_a.Append(FPL("sub_a"));
        ASSERT_TRUE(CreateDirectory(sub_a));

        FilePath file_txt = sub_a.Append(FPL("file.txt"));
        CreateTextFile(file_txt, bogus_content);

        // Want a directory whose name is long enough to make the path to the file
        // inside just under MAX_PATH chars.  This will be used to test that when
        // a junction expands to a path over MAX_PATH chars in length,
        // NormalizeFilePath() fails without crashing.
        FilePath sub_long_rel(FPL("sub_long"));
        FilePath deep_txt(FPL("deep.txt"));

        int target_length = MAX_PATH;
        target_length -= (sub_a.value().length() + 1); // +1 for the sepperator '\'.
        target_length -= (sub_long_rel.Append(deep_txt).value().length() + 1);
        // Without making the path a bit shorter, CreateDirectory() fails.
        // the resulting path is still long enough to hit the failing case in
        // NormalizePath().
        const int kCreateDirLimit = 4;
        target_length -= kCreateDirLimit;
        FilePath::StringType long_name_str = FPL("long_name_");
        long_name_str.resize(target_length, '_');

        FilePath long_name = sub_a.Append(FilePath(long_name_str));
        FilePath deep_file = long_name.Append(sub_long_rel).Append(deep_txt);
        ASSERT_EQ(static_cast<size_t>(MAX_PATH - kCreateDirLimit),
            deep_file.value().length());

        FilePath sub_long = deep_file.DirName();
        ASSERT_TRUE(CreateDirectory(sub_long));
        CreateTextFile(deep_file, bogus_content);

        FilePath base_b = temp_dir_.path().Append(FPL("base_b"));
        ASSERT_TRUE(CreateDirectory(base_b));

        FilePath to_sub_a = base_b.Append(FPL("to_sub_a"));
        ASSERT_TRUE(CreateDirectory(to_sub_a));
        FilePath normalized_path;
        {
            ReparsePoint reparse_to_sub_a(to_sub_a, sub_a);
            ASSERT_TRUE(reparse_to_sub_a.IsValid());

            FilePath to_base_b = base_b.Append(FPL("to_base_b"));
            ASSERT_TRUE(CreateDirectory(to_base_b));
            ReparsePoint reparse_to_base_b(to_base_b, base_b);
            ASSERT_TRUE(reparse_to_base_b.IsValid());

            FilePath to_sub_long = base_b.Append(FPL("to_sub_long"));
            ASSERT_TRUE(CreateDirectory(to_sub_long));
            ReparsePoint reparse_to_sub_long(to_sub_long, sub_long);
            ASSERT_TRUE(reparse_to_sub_long.IsValid());

            // Normalize a junction free path: base_a\sub_a\file.txt .
            ASSERT_TRUE(NormalizeFilePath(file_txt, &normalized_path));
            ASSERT_STREQ(file_txt.value().c_str(), normalized_path.value().c_str());

            // Check that the path base_b\to_sub_a\file.txt can be normalized to exclude
            // the junction to_sub_a.
            ASSERT_TRUE(NormalizeFilePath(to_sub_a.Append(FPL("file.txt")),
                &normalized_path));
            ASSERT_STREQ(file_txt.value().c_str(), normalized_path.value().c_str());

            // Check that the path base_b\to_base_b\to_base_b\to_sub_a\file.txt can be
            // normalized to exclude junctions to_base_b and to_sub_a .
            ASSERT_TRUE(NormalizeFilePath(base_b.Append(FPL("to_base_b"))
                                              .Append(FPL("to_base_b"))
                                              .Append(FPL("to_sub_a"))
                                              .Append(FPL("file.txt")),
                &normalized_path));
            ASSERT_STREQ(file_txt.value().c_str(), normalized_path.value().c_str());

            // A long enough path will cause NormalizeFilePath() to fail.  Make a long
            // path using to_base_b many times, and check that paths long enough to fail
            // do not cause a crash.
            FilePath long_path = base_b;
            const int kLengthLimit = MAX_PATH + 200;
            while (long_path.value().length() <= kLengthLimit) {
                long_path = long_path.Append(FPL("to_base_b"));
            }
            long_path = long_path.Append(FPL("to_sub_a"))
                            .Append(FPL("file.txt"));

            ASSERT_FALSE(NormalizeFilePath(long_path, &normalized_path));

            // Normalizing the junction to deep.txt should fail, because the expanded
            // path to deep.txt is longer than MAX_PATH.
            ASSERT_FALSE(NormalizeFilePath(to_sub_long.Append(deep_txt),
                &normalized_path));

            // Delete the reparse points, and see that NormalizeFilePath() fails
            // to traverse them.
        }

        ASSERT_FALSE(NormalizeFilePath(to_sub_a.Append(FPL("file.txt")),
            &normalized_path));
    }

    TEST_F(FileUtilTest, DevicePathToDriveLetter)
    {
        // Get a drive letter.
        string16 real_drive_letter = ToUpperASCII(temp_dir_.path().value().substr(0, 2));
        if (!isalpha(real_drive_letter[0]) || ':' != real_drive_letter[1]) {
            LOG(ERROR) << "Can't get a drive letter to test with.";
            return;
        }

        // Get the NT style path to that drive.
        wchar_t device_path[MAX_PATH] = { '\0' };
        ASSERT_TRUE(
            ::QueryDosDevice(real_drive_letter.c_str(), device_path, MAX_PATH));
        FilePath actual_device_path(device_path);
        FilePath win32_path;

        // Run DevicePathToDriveLetterPath() on the NT style path we got from
        // QueryDosDevice().  Expect the drive letter we started with.
        ASSERT_TRUE(DevicePathToDriveLetterPath(actual_device_path, &win32_path));
        ASSERT_EQ(real_drive_letter, win32_path.value());

        // Add some directories to the path.  Expect those extra path componenets
        // to be preserved.
        FilePath kRelativePath(FPL("dir1\\dir2\\file.txt"));
        ASSERT_TRUE(DevicePathToDriveLetterPath(
            actual_device_path.Append(kRelativePath),
            &win32_path));
        EXPECT_EQ(FilePath(real_drive_letter + L"\\").Append(kRelativePath).value(),
            win32_path.value());

        // Deform the real path so that it is invalid by removing the last four
        // characters.  The way windows names devices that are hard disks
        // (\Device\HardDiskVolume${NUMBER}) guarantees that the string is longer
        // than three characters.  The only way the truncated string could be a
        // real drive is if more than 10^3 disks are mounted:
        // \Device\HardDiskVolume10000 would be truncated to \Device\HardDiskVolume1
        // Check that DevicePathToDriveLetterPath fails.
        int path_length = actual_device_path.value().length();
        int new_length = path_length - 4;
        ASSERT_LT(0, new_length);
        FilePath prefix_of_real_device_path(
            actual_device_path.value().substr(0, new_length));
        ASSERT_FALSE(DevicePathToDriveLetterPath(prefix_of_real_device_path,
            &win32_path));

        ASSERT_FALSE(DevicePathToDriveLetterPath(
            prefix_of_real_device_path.Append(kRelativePath),
            &win32_path));

        // Deform the real path so that it is invalid by adding some characters. For
        // example, if C: maps to \Device\HardDiskVolume8, then we simulate a
        // request for the drive letter whose native path is
        // \Device\HardDiskVolume812345 .  We assume such a device does not exist,
        // because drives are numbered in order and mounting 112345 hard disks will
        // never happen.
        const FilePath::StringType kExtraChars = FPL("12345");

        FilePath real_device_path_plus_numbers(
            actual_device_path.value() + kExtraChars);

        ASSERT_FALSE(DevicePathToDriveLetterPath(
            real_device_path_plus_numbers,
            &win32_path));

        ASSERT_FALSE(DevicePathToDriveLetterPath(
            real_device_path_plus_numbers.Append(kRelativePath),
            &win32_path));
    }

    TEST_F(FileUtilTest, CreateTemporaryFileInDirLongPathTest)
    {
        // Test that CreateTemporaryFileInDir() creates a path and returns a long path
        // if it is available. This test requires that:
        // - the filesystem at |temp_dir_| supports long filenames.
        // - the account has FILE_LIST_DIRECTORY permission for all ancestor
        //   directories of |temp_dir_|.
        const FilePath::CharType kLongDirName[] = FPL("A long path");
        const FilePath::CharType kTestSubDirName[] = FPL("test");
        FilePath long_test_dir = temp_dir_.path().Append(kLongDirName);
        ASSERT_TRUE(CreateDirectory(long_test_dir));

        // kLongDirName is not a 8.3 component. So GetShortName() should give us a
        // different short name.
        WCHAR path_buffer[MAX_PATH];
        DWORD path_buffer_length = GetShortPathName(long_test_dir.value().c_str(),
            path_buffer, MAX_PATH);
        ASSERT_LT(path_buffer_length, DWORD(MAX_PATH));
        ASSERT_NE(DWORD(0), path_buffer_length);
        FilePath short_test_dir(path_buffer);
        ASSERT_STRNE(kLongDirName, short_test_dir.BaseName().value().c_str());

        FilePath temp_file;
        ASSERT_TRUE(CreateTemporaryFileInDir(short_test_dir, &temp_file));
        EXPECT_STREQ(kLongDirName, temp_file.DirName().BaseName().value().c_str());
        EXPECT_TRUE(PathExists(temp_file));

        // Create a subdirectory of |long_test_dir| and make |long_test_dir|
        // unreadable. We should still be able to create a temp file in the
        // subdirectory, but we won't be able to determine the long path for it. This
        // mimics the environment that some users run where their user profiles reside
        // in a location where the don't have full access to the higher level
        // directories. (Note that this assumption is true for NTFS, but not for some
        // network file systems. E.g. AFS).
        FilePath access_test_dir = long_test_dir.Append(kTestSubDirName);
        ASSERT_TRUE(CreateDirectory(access_test_dir));
        FilePermissionRestorer long_test_dir_restorer(long_test_dir);
        ASSERT_TRUE(MakeFileUnreadable(long_test_dir));

        // Use the short form of the directory to create a temporary filename.
        ASSERT_TRUE(CreateTemporaryFileInDir(
            short_test_dir.Append(kTestSubDirName), &temp_file));
        EXPECT_TRUE(PathExists(temp_file));
        EXPECT_TRUE(short_test_dir.IsParent(temp_file.DirName()));

        // Check that the long path can't be determined for |temp_file|.
        path_buffer_length = GetLongPathName(temp_file.value().c_str(),
            path_buffer, MAX_PATH);
        EXPECT_EQ(DWORD(0), path_buffer_length);
    }

#endif // defined(OS_WIN)

#if defined(OS_POSIX)

    TEST_F(FileUtilTest, CreateAndReadSymlinks)
    {
        FilePath link_from = temp_dir_.path().Append(FPL("from_file"));
        FilePath link_to = temp_dir_.path().Append(FPL("to_file"));
        CreateTextFile(link_to, bogus_content);

        ASSERT_TRUE(CreateSymbolicLink(link_to, link_from))
            << "Failed to create file symlink.";

        // If we created the link properly, we should be able to read the contents
        // through it.
        std::wstring contents = ReadTextFile(link_from);
        EXPECT_EQ(bogus_content, contents);

        FilePath result;
        ASSERT_TRUE(ReadSymbolicLink(link_from, &result));
        EXPECT_EQ(link_to.value(), result.value());

        // Link to a directory.
        link_from = temp_dir_.path().Append(FPL("from_dir"));
        link_to = temp_dir_.path().Append(FPL("to_dir"));
        ASSERT_TRUE(CreateDirectory(link_to));
        ASSERT_TRUE(CreateSymbolicLink(link_to, link_from))
            << "Failed to create directory symlink.";

        // Test failures.
        EXPECT_FALSE(CreateSymbolicLink(link_to, link_to));
        EXPECT_FALSE(ReadSymbolicLink(link_to, &result));
        FilePath missing = temp_dir_.path().Append(FPL("missing"));
        EXPECT_FALSE(ReadSymbolicLink(missing, &result));
    }

    // The following test of NormalizeFilePath() require that we create a symlink.
    // This can not be done on Windows before Vista.  On Vista, creating a symlink
    // requires privilege "SeCreateSymbolicLinkPrivilege".
    // TODO(skerner): Investigate the possibility of giving base_unittests the
    // privileges required to create a symlink.
    TEST_F(FileUtilTest, NormalizeFilePathSymlinks)
    {
        // Link one file to another.
        FilePath link_from = temp_dir_.path().Append(FPL("from_file"));
        FilePath link_to = temp_dir_.path().Append(FPL("to_file"));
        CreateTextFile(link_to, bogus_content);

        ASSERT_TRUE(CreateSymbolicLink(link_to, link_from))
            << "Failed to create file symlink.";

        // Check that NormalizeFilePath sees the link.
        FilePath normalized_path;
        ASSERT_TRUE(NormalizeFilePath(link_from, &normalized_path));
        EXPECT_NE(link_from, link_to);
        EXPECT_EQ(link_to.BaseName().value(), normalized_path.BaseName().value());
        EXPECT_EQ(link_to.BaseName().value(), normalized_path.BaseName().value());

        // Link to a directory.
        link_from = temp_dir_.path().Append(FPL("from_dir"));
        link_to = temp_dir_.path().Append(FPL("to_dir"));
        ASSERT_TRUE(CreateDirectory(link_to));
        ASSERT_TRUE(CreateSymbolicLink(link_to, link_from))
            << "Failed to create directory symlink.";

        EXPECT_FALSE(NormalizeFilePath(link_from, &normalized_path))
            << "Links to directories should return false.";

        // Test that a loop in the links causes NormalizeFilePath() to return false.
        link_from = temp_dir_.path().Append(FPL("link_a"));
        link_to = temp_dir_.path().Append(FPL("link_b"));
        ASSERT_TRUE(CreateSymbolicLink(link_to, link_from))
            << "Failed to create loop symlink a.";
        ASSERT_TRUE(CreateSymbolicLink(link_from, link_to))
            << "Failed to create loop symlink b.";

        // Infinite loop!
        EXPECT_FALSE(NormalizeFilePath(link_from, &normalized_path));
    }
#endif // defined(OS_POSIX)

    TEST_F(FileUtilTest, DeleteNonExistent)
    {
        FilePath non_existent = temp_dir_.path().AppendASCII("bogus_file_dne.foobar");
        ASSERT_FALSE(PathExists(non_existent));

        EXPECT_TRUE(DeleteFile(non_existent, false));
        ASSERT_FALSE(PathExists(non_existent));
        EXPECT_TRUE(DeleteFile(non_existent, true));
        ASSERT_FALSE(PathExists(non_existent));
    }

    TEST_F(FileUtilTest, DeleteNonExistentWithNonExistentParent)
    {
        FilePath non_existent = temp_dir_.path().AppendASCII("bogus_topdir");
        non_existent = non_existent.AppendASCII("bogus_subdir");
        ASSERT_FALSE(PathExists(non_existent));

        EXPECT_TRUE(DeleteFile(non_existent, false));
        ASSERT_FALSE(PathExists(non_existent));
        EXPECT_TRUE(DeleteFile(non_existent, true));
        ASSERT_FALSE(PathExists(non_existent));
    }

    TEST_F(FileUtilTest, DeleteFile)
    {
        // Create a file
        FilePath file_name = temp_dir_.path().Append(FPL("Test DeleteFile 1.txt"));
        CreateTextFile(file_name, bogus_content);
        ASSERT_TRUE(PathExists(file_name));

        // Make sure it's deleted
        EXPECT_TRUE(DeleteFile(file_name, false));
        EXPECT_FALSE(PathExists(file_name));

        // Test recursive case, create a new file
        file_name = temp_dir_.path().Append(FPL("Test DeleteFile 2.txt"));
        CreateTextFile(file_name, bogus_content);
        ASSERT_TRUE(PathExists(file_name));

        // Make sure it's deleted
        EXPECT_TRUE(DeleteFile(file_name, true));
        EXPECT_FALSE(PathExists(file_name));
    }

#if defined(OS_POSIX)
    TEST_F(FileUtilTest, DeleteSymlinkToExistentFile)
    {
        // Create a file.
        FilePath file_name = temp_dir_.path().Append(FPL("Test DeleteFile 2.txt"));
        CreateTextFile(file_name, bogus_content);
        ASSERT_TRUE(PathExists(file_name));

        // Create a symlink to the file.
        FilePath file_link = temp_dir_.path().Append("file_link_2");
        ASSERT_TRUE(CreateSymbolicLink(file_name, file_link))
            << "Failed to create symlink.";

        // Delete the symbolic link.
        EXPECT_TRUE(DeleteFile(file_link, false));

        // Make sure original file is not deleted.
        EXPECT_FALSE(PathExists(file_link));
        EXPECT_TRUE(PathExists(file_name));
    }

    TEST_F(FileUtilTest, DeleteSymlinkToNonExistentFile)
    {
        // Create a non-existent file path.
        FilePath non_existent = temp_dir_.path().Append(FPL("Test DeleteFile 3.txt"));
        EXPECT_FALSE(PathExists(non_existent));

        // Create a symlink to the non-existent file.
        FilePath file_link = temp_dir_.path().Append("file_link_3");
        ASSERT_TRUE(CreateSymbolicLink(non_existent, file_link))
            << "Failed to create symlink.";

        // Make sure the symbolic link is exist.
        EXPECT_TRUE(IsLink(file_link));
        EXPECT_FALSE(PathExists(file_link));

        // Delete the symbolic link.
        EXPECT_TRUE(DeleteFile(file_link, false));

        // Make sure the symbolic link is deleted.
        EXPECT_FALSE(IsLink(file_link));
    }

    TEST_F(FileUtilTest, ChangeFilePermissionsAndRead)
    {
        // Create a file path.
        FilePath file_name = temp_dir_.path().Append(FPL("Test Readable File.txt"));
        EXPECT_FALSE(PathExists(file_name));

        const std::string kData("hello");

        int buffer_size = kData.length();
        char* buffer = new char[buffer_size];

        // Write file.
        EXPECT_EQ(static_cast<int>(kData.length()),
            WriteFile(file_name, kData.data(), kData.length()));
        EXPECT_TRUE(PathExists(file_name));

        // Make sure the file is readable.
        int32_t mode = 0;
        EXPECT_TRUE(GetPosixFilePermissions(file_name, &mode));
        EXPECT_TRUE(mode & FILE_PERMISSION_READ_BY_USER);

        // Get rid of the read permission.
        EXPECT_TRUE(SetPosixFilePermissions(file_name, 0u));
        EXPECT_TRUE(GetPosixFilePermissions(file_name, &mode));
        EXPECT_FALSE(mode & FILE_PERMISSION_READ_BY_USER);
        // Make sure the file can't be read.
        EXPECT_EQ(-1, ReadFile(file_name, buffer, buffer_size));

        // Give the read permission.
        EXPECT_TRUE(SetPosixFilePermissions(file_name, FILE_PERMISSION_READ_BY_USER));
        EXPECT_TRUE(GetPosixFilePermissions(file_name, &mode));
        EXPECT_TRUE(mode & FILE_PERMISSION_READ_BY_USER);
        // Make sure the file can be read.
        EXPECT_EQ(static_cast<int>(kData.length()),
            ReadFile(file_name, buffer, buffer_size));

        // Delete the file.
        EXPECT_TRUE(DeleteFile(file_name, false));
        EXPECT_FALSE(PathExists(file_name));

        delete[] buffer;
    }

    TEST_F(FileUtilTest, ChangeFilePermissionsAndWrite)
    {
        // Create a file path.
        FilePath file_name = temp_dir_.path().Append(FPL("Test Readable File.txt"));
        EXPECT_FALSE(PathExists(file_name));

        const std::string kData("hello");

        // Write file.
        EXPECT_EQ(static_cast<int>(kData.length()),
            WriteFile(file_name, kData.data(), kData.length()));
        EXPECT_TRUE(PathExists(file_name));

        // Make sure the file is writable.
        int mode = 0;
        EXPECT_TRUE(GetPosixFilePermissions(file_name, &mode));
        EXPECT_TRUE(mode & FILE_PERMISSION_WRITE_BY_USER);
        EXPECT_TRUE(PathIsWritable(file_name));

        // Get rid of the write permission.
        EXPECT_TRUE(SetPosixFilePermissions(file_name, 0u));
        EXPECT_TRUE(GetPosixFilePermissions(file_name, &mode));
        EXPECT_FALSE(mode & FILE_PERMISSION_WRITE_BY_USER);
        // Make sure the file can't be write.
        EXPECT_EQ(-1, WriteFile(file_name, kData.data(), kData.length()));
        EXPECT_FALSE(PathIsWritable(file_name));

        // Give read permission.
        EXPECT_TRUE(SetPosixFilePermissions(file_name,
            FILE_PERMISSION_WRITE_BY_USER));
        EXPECT_TRUE(GetPosixFilePermissions(file_name, &mode));
        EXPECT_TRUE(mode & FILE_PERMISSION_WRITE_BY_USER);
        // Make sure the file can be write.
        EXPECT_EQ(static_cast<int>(kData.length()),
            WriteFile(file_name, kData.data(), kData.length()));
        EXPECT_TRUE(PathIsWritable(file_name));

        // Delete the file.
        EXPECT_TRUE(DeleteFile(file_name, false));
        EXPECT_FALSE(PathExists(file_name));
    }

    TEST_F(FileUtilTest, ChangeDirectoryPermissionsAndEnumerate)
    {
        // Create a directory path.
        FilePath subdir_path = temp_dir_.path().Append(FPL("PermissionTest1"));
        CreateDirectory(subdir_path);
        ASSERT_TRUE(PathExists(subdir_path));

        // Create a dummy file to enumerate.
        FilePath file_name = subdir_path.Append(FPL("Test Readable File.txt"));
        EXPECT_FALSE(PathExists(file_name));
        const std::string kData("hello");
        EXPECT_EQ(static_cast<int>(kData.length()),
            WriteFile(file_name, kData.data(), kData.length()));
        EXPECT_TRUE(PathExists(file_name));

        // Make sure the directory has the all permissions.
        int mode = 0;
        EXPECT_TRUE(GetPosixFilePermissions(subdir_path, &mode));
        EXPECT_EQ(FILE_PERMISSION_USER_MASK, mode & FILE_PERMISSION_USER_MASK);

        // Get rid of the permissions from the directory.
        EXPECT_TRUE(SetPosixFilePermissions(subdir_path, 0u));
        EXPECT_TRUE(GetPosixFilePermissions(subdir_path, &mode));
        EXPECT_FALSE(mode & FILE_PERMISSION_USER_MASK);

        // Make sure the file in the directory can't be enumerated.
        FileEnumerator f1(subdir_path, true, FileEnumerator::FILES);
        EXPECT_TRUE(PathExists(subdir_path));
        FindResultCollector c1(&f1);
        EXPECT_EQ(0, c1.size());
        EXPECT_FALSE(GetPosixFilePermissions(file_name, &mode));

        // Give the permissions to the directory.
        EXPECT_TRUE(SetPosixFilePermissions(subdir_path, FILE_PERMISSION_USER_MASK));
        EXPECT_TRUE(GetPosixFilePermissions(subdir_path, &mode));
        EXPECT_EQ(FILE_PERMISSION_USER_MASK, mode & FILE_PERMISSION_USER_MASK);

        // Make sure the file in the directory can be enumerated.
        FileEnumerator f2(subdir_path, true, FileEnumerator::FILES);
        FindResultCollector c2(&f2);
        EXPECT_TRUE(c2.HasFile(file_name));
        EXPECT_EQ(1, c2.size());

        // Delete the file.
        EXPECT_TRUE(DeleteFile(subdir_path, true));
        EXPECT_FALSE(PathExists(subdir_path));
    }

    TEST_F(FileUtilTest, ExecutableExistsInPath)
    {
        // Create two directories that we will put in our PATH
        const char kPath[] = "PATH";
        const FilePath::CharType kDir1[] = FPL("dir1");
        const FilePath::CharType kDir2[] = FPL("dir2");

        FilePath dir1 = temp_dir_.path().Append(kDir1);
        FilePath dir2 = temp_dir_.path().Append(kDir2);
        ASSERT_TRUE(CreateDirectory(dir1));
        ASSERT_TRUE(CreateDirectory(dir2));

        std::unique_ptr<Environment> env(base::Environment::Create());

        ASSERT_TRUE(env->SetVar(kPath, dir1.value() + ":" + dir2.value()));

        const FilePath::CharType kRegularFileName[] = FPL("regular_file");
        const FilePath::CharType kExeFileName[] = FPL("exe");
        const FilePath::CharType kDneFileName[] = FPL("does_not_exist");

        const FilePath kExePath = dir1.Append(kExeFileName);
        const FilePath kRegularFilePath = dir2.Append(kRegularFileName);

        // Write file.
        const std::string kData("hello");
        ASSERT_EQ(static_cast<int>(kData.length()),
            WriteFile(kExePath, kData.data(), kData.length()));
        ASSERT_TRUE(PathExists(kExePath));
        ASSERT_EQ(static_cast<int>(kData.length()),
            WriteFile(kRegularFilePath, kData.data(), kData.length()));
        ASSERT_TRUE(PathExists(kRegularFilePath));

        ASSERT_TRUE(SetPosixFilePermissions(dir1.Append(kExeFileName),
            FILE_PERMISSION_EXECUTE_BY_USER));

        EXPECT_TRUE(ExecutableExistsInPath(env.get(), kExeFileName));
        EXPECT_FALSE(ExecutableExistsInPath(env.get(), kRegularFileName));
        EXPECT_FALSE(ExecutableExistsInPath(env.get(), kDneFileName));
    }

#endif // defined(OS_POSIX)

#if defined(OS_WIN)
    // Tests that the Delete function works for wild cards, especially
    // with the recursion flag.  Also coincidentally tests PathExists.
    // TODO(erikkay): see if anyone's actually using this feature of the API
    TEST_F(FileUtilTest, DeleteWildCard)
    {
        // Create a file and a directory
        FilePath file_name = temp_dir_.path().Append(FPL("Test DeleteWildCard.txt"));
        CreateTextFile(file_name, bogus_content);
        ASSERT_TRUE(PathExists(file_name));

        FilePath subdir_path = temp_dir_.path().Append(FPL("DeleteWildCardDir"));
        CreateDirectory(subdir_path);
        ASSERT_TRUE(PathExists(subdir_path));

        // Create the wildcard path
        FilePath directory_contents = temp_dir_.path();
        directory_contents = directory_contents.Append(FPL("*"));

        // Delete non-recursively and check that only the file is deleted
        EXPECT_TRUE(DeleteFile(directory_contents, false));
        EXPECT_FALSE(PathExists(file_name));
        EXPECT_TRUE(PathExists(subdir_path));

        // Delete recursively and make sure all contents are deleted
        EXPECT_TRUE(DeleteFile(directory_contents, true));
        EXPECT_FALSE(PathExists(file_name));
        EXPECT_FALSE(PathExists(subdir_path));
    }

    // TODO(erikkay): see if anyone's actually using this feature of the API
    TEST_F(FileUtilTest, DeleteNonExistantWildCard)
    {
        // Create a file and a directory
        FilePath subdir_path = temp_dir_.path().Append(FPL("DeleteNonExistantWildCard"));
        CreateDirectory(subdir_path);
        ASSERT_TRUE(PathExists(subdir_path));

        // Create the wildcard path
        FilePath directory_contents = subdir_path;
        directory_contents = directory_contents.Append(FPL("*"));

        // Delete non-recursively and check nothing got deleted
        EXPECT_TRUE(DeleteFile(directory_contents, false));
        EXPECT_TRUE(PathExists(subdir_path));

        // Delete recursively and check nothing got deleted
        EXPECT_TRUE(DeleteFile(directory_contents, true));
        EXPECT_TRUE(PathExists(subdir_path));
    }
#endif

    // Tests non-recursive Delete() for a directory.
    TEST_F(FileUtilTest, DeleteDirNonRecursive)
    {
        // Create a subdirectory and put a file and two directories inside.
        FilePath test_subdir = temp_dir_.path().Append(FPL("DeleteDirNonRecursive"));
        CreateDirectory(test_subdir);
        ASSERT_TRUE(PathExists(test_subdir));

        FilePath file_name = test_subdir.Append(FPL("Test DeleteDir.txt"));
        CreateTextFile(file_name, bogus_content);
        ASSERT_TRUE(PathExists(file_name));

        FilePath subdir_path1 = test_subdir.Append(FPL("TestSubDir1"));
        CreateDirectory(subdir_path1);
        ASSERT_TRUE(PathExists(subdir_path1));

        FilePath subdir_path2 = test_subdir.Append(FPL("TestSubDir2"));
        CreateDirectory(subdir_path2);
        ASSERT_TRUE(PathExists(subdir_path2));

        // Delete non-recursively and check that the empty dir got deleted
        EXPECT_TRUE(DeleteFile(subdir_path2, false));
        EXPECT_FALSE(PathExists(subdir_path2));

        // Delete non-recursively and check that nothing got deleted
        EXPECT_FALSE(DeleteFile(test_subdir, false));
        EXPECT_TRUE(PathExists(test_subdir));
        EXPECT_TRUE(PathExists(file_name));
        EXPECT_TRUE(PathExists(subdir_path1));
    }

    // Tests recursive Delete() for a directory.
    TEST_F(FileUtilTest, DeleteDirRecursive)
    {
        // Create a subdirectory and put a file and two directories inside.
        FilePath test_subdir = temp_dir_.path().Append(FPL("DeleteDirRecursive"));
        CreateDirectory(test_subdir);
        ASSERT_TRUE(PathExists(test_subdir));

        FilePath file_name = test_subdir.Append(FPL("Test DeleteDirRecursive.txt"));
        CreateTextFile(file_name, bogus_content);
        ASSERT_TRUE(PathExists(file_name));

        FilePath subdir_path1 = test_subdir.Append(FPL("TestSubDir1"));
        CreateDirectory(subdir_path1);
        ASSERT_TRUE(PathExists(subdir_path1));

        FilePath subdir_path2 = test_subdir.Append(FPL("TestSubDir2"));
        CreateDirectory(subdir_path2);
        ASSERT_TRUE(PathExists(subdir_path2));

        // Delete recursively and check that the empty dir got deleted
        EXPECT_TRUE(DeleteFile(subdir_path2, true));
        EXPECT_FALSE(PathExists(subdir_path2));

        // Delete recursively and check that everything got deleted
        EXPECT_TRUE(DeleteFile(test_subdir, true));
        EXPECT_FALSE(PathExists(file_name));
        EXPECT_FALSE(PathExists(subdir_path1));
        EXPECT_FALSE(PathExists(test_subdir));
    }

    TEST_F(FileUtilTest, MoveFileNew)
    {
        // Create a file
        FilePath file_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Move_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // The destination.
        FilePath file_name_to = temp_dir_.path().Append(
            FILE_PATH_LITERAL("Move_Test_File_Destination.txt"));
        ASSERT_FALSE(PathExists(file_name_to));

        EXPECT_TRUE(Move(file_name_from, file_name_to));

        // Check everything has been moved.
        EXPECT_FALSE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(file_name_to));
    }

    TEST_F(FileUtilTest, MoveFileExists)
    {
        // Create a file
        FilePath file_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Move_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // The destination name.
        FilePath file_name_to = temp_dir_.path().Append(
            FILE_PATH_LITERAL("Move_Test_File_Destination.txt"));
        CreateTextFile(file_name_to, L"Old file content");
        ASSERT_TRUE(PathExists(file_name_to));

        EXPECT_TRUE(Move(file_name_from, file_name_to));

        // Check everything has been moved.
        EXPECT_FALSE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(file_name_to));
        EXPECT_TRUE(L"Gooooooooooooooooooooogle" == ReadTextFile(file_name_to));
    }

    TEST_F(FileUtilTest, MoveFileDirExists)
    {
        // Create a file
        FilePath file_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Move_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // The destination directory
        FilePath dir_name_to = temp_dir_.path().Append(FILE_PATH_LITERAL("Destination"));
        CreateDirectory(dir_name_to);
        ASSERT_TRUE(PathExists(dir_name_to));

        EXPECT_FALSE(Move(file_name_from, dir_name_to));
    }

    TEST_F(FileUtilTest, MoveNew)
    {
        // Create a directory
        FilePath dir_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Move_From_Subdir"));
        CreateDirectory(dir_name_from);
        ASSERT_TRUE(PathExists(dir_name_from));

        // Create a file under the directory
        FilePath txt_file_name(FILE_PATH_LITERAL("Move_Test_File.txt"));
        FilePath file_name_from = dir_name_from.Append(txt_file_name);
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // Move the directory.
        FilePath dir_name_to = temp_dir_.path().Append(FILE_PATH_LITERAL("Move_To_Subdir"));
        FilePath file_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Move_Test_File.txt"));

        ASSERT_FALSE(PathExists(dir_name_to));

        EXPECT_TRUE(Move(dir_name_from, dir_name_to));

        // Check everything has been moved.
        EXPECT_FALSE(PathExists(dir_name_from));
        EXPECT_FALSE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(dir_name_to));
        EXPECT_TRUE(PathExists(file_name_to));

        // Test path traversal.
        file_name_from = dir_name_to.Append(txt_file_name);
        file_name_to = dir_name_to.Append(FILE_PATH_LITERAL(".."));
        file_name_to = file_name_to.Append(txt_file_name);
        EXPECT_FALSE(Move(file_name_from, file_name_to));
        EXPECT_TRUE(PathExists(file_name_from));
        EXPECT_FALSE(PathExists(file_name_to));
        EXPECT_TRUE(internal::MoveUnsafe(file_name_from, file_name_to));
        EXPECT_FALSE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(file_name_to));
    }

    TEST_F(FileUtilTest, MoveExist)
    {
        // Create a directory
        FilePath dir_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Move_From_Subdir"));
        CreateDirectory(dir_name_from);
        ASSERT_TRUE(PathExists(dir_name_from));

        // Create a file under the directory
        FilePath file_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Move_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // Move the directory
        FilePath dir_name_exists = temp_dir_.path().Append(FILE_PATH_LITERAL("Destination"));

        FilePath dir_name_to = dir_name_exists.Append(FILE_PATH_LITERAL("Move_To_Subdir"));
        FilePath file_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Move_Test_File.txt"));

        // Create the destination directory.
        CreateDirectory(dir_name_exists);
        ASSERT_TRUE(PathExists(dir_name_exists));

        EXPECT_TRUE(Move(dir_name_from, dir_name_to));

        // Check everything has been moved.
        EXPECT_FALSE(PathExists(dir_name_from));
        EXPECT_FALSE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(dir_name_to));
        EXPECT_TRUE(PathExists(file_name_to));
    }

    TEST_F(FileUtilTest, CopyDirectoryRecursivelyNew)
    {
        // Create a directory.
        FilePath dir_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_From_Subdir"));
        CreateDirectory(dir_name_from);
        ASSERT_TRUE(PathExists(dir_name_from));

        // Create a file under the directory.
        FilePath file_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // Create a subdirectory.
        FilePath subdir_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Subdir"));
        CreateDirectory(subdir_name_from);
        ASSERT_TRUE(PathExists(subdir_name_from));

        // Create a file under the subdirectory.
        FilePath file_name2_from = subdir_name_from.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name2_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name2_from));

        // Copy the directory recursively.
        FilePath dir_name_to = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_To_Subdir"));
        FilePath file_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        FilePath subdir_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Subdir"));
        FilePath file_name2_to = subdir_name_to.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));

        ASSERT_FALSE(PathExists(dir_name_to));

        EXPECT_TRUE(CopyDirectory(dir_name_from, dir_name_to, true));

        // Check everything has been copied.
        EXPECT_TRUE(PathExists(dir_name_from));
        EXPECT_TRUE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(subdir_name_from));
        EXPECT_TRUE(PathExists(file_name2_from));
        EXPECT_TRUE(PathExists(dir_name_to));
        EXPECT_TRUE(PathExists(file_name_to));
        EXPECT_TRUE(PathExists(subdir_name_to));
        EXPECT_TRUE(PathExists(file_name2_to));
    }

    TEST_F(FileUtilTest, CopyDirectoryRecursivelyExists)
    {
        // Create a directory.
        FilePath dir_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_From_Subdir"));
        CreateDirectory(dir_name_from);
        ASSERT_TRUE(PathExists(dir_name_from));

        // Create a file under the directory.
        FilePath file_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // Create a subdirectory.
        FilePath subdir_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Subdir"));
        CreateDirectory(subdir_name_from);
        ASSERT_TRUE(PathExists(subdir_name_from));

        // Create a file under the subdirectory.
        FilePath file_name2_from = subdir_name_from.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name2_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name2_from));

        // Copy the directory recursively.
        FilePath dir_name_exists = temp_dir_.path().Append(FILE_PATH_LITERAL("Destination"));

        FilePath dir_name_to = dir_name_exists.Append(FILE_PATH_LITERAL("Copy_From_Subdir"));
        FilePath file_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        FilePath subdir_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Subdir"));
        FilePath file_name2_to = subdir_name_to.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));

        // Create the destination directory.
        CreateDirectory(dir_name_exists);
        ASSERT_TRUE(PathExists(dir_name_exists));

        EXPECT_TRUE(CopyDirectory(dir_name_from, dir_name_exists, true));

        // Check everything has been copied.
        EXPECT_TRUE(PathExists(dir_name_from));
        EXPECT_TRUE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(subdir_name_from));
        EXPECT_TRUE(PathExists(file_name2_from));
        EXPECT_TRUE(PathExists(dir_name_to));
        EXPECT_TRUE(PathExists(file_name_to));
        EXPECT_TRUE(PathExists(subdir_name_to));
        EXPECT_TRUE(PathExists(file_name2_to));
    }

    TEST_F(FileUtilTest, CopyDirectoryNew)
    {
        // Create a directory.
        FilePath dir_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_From_Subdir"));
        CreateDirectory(dir_name_from);
        ASSERT_TRUE(PathExists(dir_name_from));

        // Create a file under the directory.
        FilePath file_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // Create a subdirectory.
        FilePath subdir_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Subdir"));
        CreateDirectory(subdir_name_from);
        ASSERT_TRUE(PathExists(subdir_name_from));

        // Create a file under the subdirectory.
        FilePath file_name2_from = subdir_name_from.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name2_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name2_from));

        // Copy the directory not recursively.
        FilePath dir_name_to = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_To_Subdir"));
        FilePath file_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        FilePath subdir_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Subdir"));

        ASSERT_FALSE(PathExists(dir_name_to));

        EXPECT_TRUE(CopyDirectory(dir_name_from, dir_name_to, false));

        // Check everything has been copied.
        EXPECT_TRUE(PathExists(dir_name_from));
        EXPECT_TRUE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(subdir_name_from));
        EXPECT_TRUE(PathExists(file_name2_from));
        EXPECT_TRUE(PathExists(dir_name_to));
        EXPECT_TRUE(PathExists(file_name_to));
        EXPECT_FALSE(PathExists(subdir_name_to));
    }

    TEST_F(FileUtilTest, CopyDirectoryExists)
    {
        // Create a directory.
        FilePath dir_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_From_Subdir"));
        CreateDirectory(dir_name_from);
        ASSERT_TRUE(PathExists(dir_name_from));

        // Create a file under the directory.
        FilePath file_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // Create a subdirectory.
        FilePath subdir_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Subdir"));
        CreateDirectory(subdir_name_from);
        ASSERT_TRUE(PathExists(subdir_name_from));

        // Create a file under the subdirectory.
        FilePath file_name2_from = subdir_name_from.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name2_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name2_from));

        // Copy the directory not recursively.
        FilePath dir_name_to = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_To_Subdir"));
        FilePath file_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        FilePath subdir_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Subdir"));

        // Create the destination directory.
        CreateDirectory(dir_name_to);
        ASSERT_TRUE(PathExists(dir_name_to));

        EXPECT_TRUE(CopyDirectory(dir_name_from, dir_name_to, false));

        // Check everything has been copied.
        EXPECT_TRUE(PathExists(dir_name_from));
        EXPECT_TRUE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(subdir_name_from));
        EXPECT_TRUE(PathExists(file_name2_from));
        EXPECT_TRUE(PathExists(dir_name_to));
        EXPECT_TRUE(PathExists(file_name_to));
        EXPECT_FALSE(PathExists(subdir_name_to));
    }

    TEST_F(FileUtilTest, CopyFileWithCopyDirectoryRecursiveToNew)
    {
        // Create a file
        FilePath file_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // The destination name
        FilePath file_name_to = temp_dir_.path().Append(
            FILE_PATH_LITERAL("Copy_Test_File_Destination.txt"));
        ASSERT_FALSE(PathExists(file_name_to));

        EXPECT_TRUE(CopyDirectory(file_name_from, file_name_to, true));

        // Check the has been copied
        EXPECT_TRUE(PathExists(file_name_to));
    }

    TEST_F(FileUtilTest, CopyFileWithCopyDirectoryRecursiveToExisting)
    {
        // Create a file
        FilePath file_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // The destination name
        FilePath file_name_to = temp_dir_.path().Append(
            FILE_PATH_LITERAL("Copy_Test_File_Destination.txt"));
        CreateTextFile(file_name_to, L"Old file content");
        ASSERT_TRUE(PathExists(file_name_to));

        EXPECT_TRUE(CopyDirectory(file_name_from, file_name_to, true));

        // Check the has been copied
        EXPECT_TRUE(PathExists(file_name_to));
        EXPECT_TRUE(L"Gooooooooooooooooooooogle" == ReadTextFile(file_name_to));
    }

    TEST_F(FileUtilTest, CopyFileWithCopyDirectoryRecursiveToExistingDirectory)
    {
        // Create a file
        FilePath file_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // The destination
        FilePath dir_name_to = temp_dir_.path().Append(FILE_PATH_LITERAL("Destination"));
        CreateDirectory(dir_name_to);
        ASSERT_TRUE(PathExists(dir_name_to));
        FilePath file_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));

        EXPECT_TRUE(CopyDirectory(file_name_from, dir_name_to, true));

        // Check the has been copied
        EXPECT_TRUE(PathExists(file_name_to));
    }

    TEST_F(FileUtilTest, CopyDirectoryWithTrailingSeparators)
    {
        // Create a directory.
        FilePath dir_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_From_Subdir"));
        CreateDirectory(dir_name_from);
        ASSERT_TRUE(PathExists(dir_name_from));

        // Create a file under the directory.
        FilePath file_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // Copy the directory recursively.
        FilePath dir_name_to = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_To_Subdir"));
        FilePath file_name_to = dir_name_to.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));

        // Create from path with trailing separators.
#if defined(OS_WIN)
        FilePath from_path = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_From_Subdir\\\\\\"));
#elif defined(OS_POSIX)
        FilePath from_path = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_From_Subdir///"));
#endif

        EXPECT_TRUE(CopyDirectory(from_path, dir_name_to, true));

        // Check everything has been copied.
        EXPECT_TRUE(PathExists(dir_name_from));
        EXPECT_TRUE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(dir_name_to));
        EXPECT_TRUE(PathExists(file_name_to));
    }

    // Sets the source file to read-only.
    void SetReadOnly(const FilePath& path, bool read_only)
    {
#if defined(OS_WIN)
        // On Windows, it involves setting/removing the 'readonly' bit.
        DWORD attrs = GetFileAttributes(path.value().c_str());
        ASSERT_NE(INVALID_FILE_ATTRIBUTES, attrs);
        ASSERT_TRUE(SetFileAttributes(
            path.value().c_str(),
            read_only ? (attrs | FILE_ATTRIBUTE_READONLY) : (attrs & ~FILE_ATTRIBUTE_READONLY)));

        DWORD expected = read_only ? ((attrs & (FILE_ATTRIBUTE_ARCHIVE | FILE_ATTRIBUTE_DIRECTORY)) | FILE_ATTRIBUTE_READONLY) : (attrs & (FILE_ATTRIBUTE_ARCHIVE | FILE_ATTRIBUTE_DIRECTORY));

        // Ignore FILE_ATTRIBUTE_NOT_CONTENT_INDEXED if present.
        attrs = GetFileAttributes(path.value().c_str()) & ~FILE_ATTRIBUTE_NOT_CONTENT_INDEXED;
        ASSERT_EQ(expected, attrs);
#else
        // On all other platforms, it involves removing/setting the write bit.
        mode_t mode = read_only ? S_IRUSR : (S_IRUSR | S_IWUSR);
        EXPECT_TRUE(SetPosixFilePermissions(
            path, DirectoryExists(path) ? (mode | S_IXUSR) : mode));
#endif
    }

    bool IsReadOnly(const FilePath& path)
    {
#if defined(OS_WIN)
        DWORD attrs = GetFileAttributes(path.value().c_str());
        EXPECT_NE(INVALID_FILE_ATTRIBUTES, attrs);
        return attrs & FILE_ATTRIBUTE_READONLY;
#else
        int mode = 0;
        EXPECT_TRUE(GetPosixFilePermissions(path, &mode));
        return !(mode & S_IWUSR);
#endif
    }

    TEST_F(FileUtilTest, CopyDirectoryACL)
    {
        // Create source directories.
        FilePath src = temp_dir_.path().Append(FILE_PATH_LITERAL("src"));
        FilePath src_subdir = src.Append(FILE_PATH_LITERAL("subdir"));
        CreateDirectory(src_subdir);
        ASSERT_TRUE(PathExists(src_subdir));

        // Create a file under the directory.
        FilePath src_file = src.Append(FILE_PATH_LITERAL("src.txt"));
        CreateTextFile(src_file, L"Gooooooooooooooooooooogle");
        SetReadOnly(src_file, true);
        ASSERT_TRUE(IsReadOnly(src_file));

        // Make directory read-only.
        SetReadOnly(src_subdir, true);
        ASSERT_TRUE(IsReadOnly(src_subdir));

        // Copy the directory recursively.
        FilePath dst = temp_dir_.path().Append(FILE_PATH_LITERAL("dst"));
        FilePath dst_file = dst.Append(FILE_PATH_LITERAL("src.txt"));
        EXPECT_TRUE(CopyDirectory(src, dst, true));

        FilePath dst_subdir = dst.Append(FILE_PATH_LITERAL("subdir"));
        ASSERT_FALSE(IsReadOnly(dst_subdir));
        ASSERT_FALSE(IsReadOnly(dst_file));

        // Give write permissions to allow deletion.
        SetReadOnly(src_subdir, false);
        ASSERT_FALSE(IsReadOnly(src_subdir));
    }

    TEST_F(FileUtilTest, CopyFile)
    {
        // Create a directory
        FilePath dir_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("Copy_From_Subdir"));
        CreateDirectory(dir_name_from);
        ASSERT_TRUE(PathExists(dir_name_from));

        // Create a file under the directory
        FilePath file_name_from = dir_name_from.Append(FILE_PATH_LITERAL("Copy_Test_File.txt"));
        const std::wstring file_contents(L"Gooooooooooooooooooooogle");
        CreateTextFile(file_name_from, file_contents);
        ASSERT_TRUE(PathExists(file_name_from));

        // Copy the file.
        FilePath dest_file = dir_name_from.Append(FILE_PATH_LITERAL("DestFile.txt"));
        ASSERT_TRUE(CopyFile(file_name_from, dest_file));

        // Try to copy the file to another location using '..' in the path.
        FilePath dest_file2(dir_name_from);
        dest_file2 = dest_file2.AppendASCII("..");
        dest_file2 = dest_file2.AppendASCII("DestFile.txt");
        ASSERT_FALSE(CopyFile(file_name_from, dest_file2));

        FilePath dest_file2_test(dir_name_from);
        dest_file2_test = dest_file2_test.DirName();
        dest_file2_test = dest_file2_test.AppendASCII("DestFile.txt");

        // Check expected copy results.
        EXPECT_TRUE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(dest_file));
        const std::wstring read_contents = ReadTextFile(dest_file);
        EXPECT_EQ(file_contents, read_contents);
        EXPECT_FALSE(PathExists(dest_file2_test));
        EXPECT_FALSE(PathExists(dest_file2));
    }

    TEST_F(FileUtilTest, CopyFileACL)
    {
        // While FileUtilTest.CopyFile asserts the content is correctly copied over,
        // this test case asserts the access control bits are meeting expectations in
        // CopyFile().
        FilePath src = temp_dir_.path().Append(FILE_PATH_LITERAL("src.txt"));
        const std::wstring file_contents(L"Gooooooooooooooooooooogle");
        CreateTextFile(src, file_contents);

        // Set the source file to read-only.
        ASSERT_FALSE(IsReadOnly(src));
        SetReadOnly(src, true);
        ASSERT_TRUE(IsReadOnly(src));

        // Copy the file.
        FilePath dst = temp_dir_.path().Append(FILE_PATH_LITERAL("dst.txt"));
        ASSERT_TRUE(CopyFile(src, dst));
        EXPECT_EQ(file_contents, ReadTextFile(dst));

        ASSERT_FALSE(IsReadOnly(dst));
    }

    // file_util winds up using autoreleased objects on the Mac, so this needs
    // to be a PlatformTest.
    typedef PlatformTest ReadOnlyFileUtilTest;

    TEST_F(ReadOnlyFileUtilTest, ContentsEqual)
    {
        FilePath data_dir;
        ASSERT_TRUE(PathService::Get(DIR_TEST_DATA, &data_dir));
        data_dir = data_dir.AppendASCII("file_util");
        ASSERT_TRUE(PathExists(data_dir));

        FilePath original_file = data_dir.Append(FILE_PATH_LITERAL("original.txt"));
        FilePath same_file = data_dir.Append(FILE_PATH_LITERAL("same.txt"));
        FilePath same_length_file = data_dir.Append(FILE_PATH_LITERAL("same_length.txt"));
        FilePath different_file = data_dir.Append(FILE_PATH_LITERAL("different.txt"));
        FilePath different_first_file = data_dir.Append(FILE_PATH_LITERAL("different_first.txt"));
        FilePath different_last_file = data_dir.Append(FILE_PATH_LITERAL("different_last.txt"));
        FilePath empty1_file = data_dir.Append(FILE_PATH_LITERAL("empty1.txt"));
        FilePath empty2_file = data_dir.Append(FILE_PATH_LITERAL("empty2.txt"));
        FilePath shortened_file = data_dir.Append(FILE_PATH_LITERAL("shortened.txt"));
        FilePath binary_file = data_dir.Append(FILE_PATH_LITERAL("binary_file.bin"));
        FilePath binary_file_same = data_dir.Append(FILE_PATH_LITERAL("binary_file_same.bin"));
        FilePath binary_file_diff = data_dir.Append(FILE_PATH_LITERAL("binary_file_diff.bin"));

        EXPECT_TRUE(ContentsEqual(original_file, original_file));
        EXPECT_TRUE(ContentsEqual(original_file, same_file));
        EXPECT_FALSE(ContentsEqual(original_file, same_length_file));
        EXPECT_FALSE(ContentsEqual(original_file, different_file));
        EXPECT_FALSE(ContentsEqual(FilePath(FILE_PATH_LITERAL("bogusname")),
            FilePath(FILE_PATH_LITERAL("bogusname"))));
        EXPECT_FALSE(ContentsEqual(original_file, different_first_file));
        EXPECT_FALSE(ContentsEqual(original_file, different_last_file));
        EXPECT_TRUE(ContentsEqual(empty1_file, empty2_file));
        EXPECT_FALSE(ContentsEqual(original_file, shortened_file));
        EXPECT_FALSE(ContentsEqual(shortened_file, original_file));
        EXPECT_TRUE(ContentsEqual(binary_file, binary_file_same));
        EXPECT_FALSE(ContentsEqual(binary_file, binary_file_diff));
    }

    TEST_F(ReadOnlyFileUtilTest, TextContentsEqual)
    {
        FilePath data_dir;
        ASSERT_TRUE(PathService::Get(DIR_TEST_DATA, &data_dir));
        data_dir = data_dir.AppendASCII("file_util");
        ASSERT_TRUE(PathExists(data_dir));

        FilePath original_file = data_dir.Append(FILE_PATH_LITERAL("original.txt"));
        FilePath same_file = data_dir.Append(FILE_PATH_LITERAL("same.txt"));
        FilePath crlf_file = data_dir.Append(FILE_PATH_LITERAL("crlf.txt"));
        FilePath shortened_file = data_dir.Append(FILE_PATH_LITERAL("shortened.txt"));
        FilePath different_file = data_dir.Append(FILE_PATH_LITERAL("different.txt"));
        FilePath different_first_file = data_dir.Append(FILE_PATH_LITERAL("different_first.txt"));
        FilePath different_last_file = data_dir.Append(FILE_PATH_LITERAL("different_last.txt"));
        FilePath first1_file = data_dir.Append(FILE_PATH_LITERAL("first1.txt"));
        FilePath first2_file = data_dir.Append(FILE_PATH_LITERAL("first2.txt"));
        FilePath empty1_file = data_dir.Append(FILE_PATH_LITERAL("empty1.txt"));
        FilePath empty2_file = data_dir.Append(FILE_PATH_LITERAL("empty2.txt"));
        FilePath blank_line_file = data_dir.Append(FILE_PATH_LITERAL("blank_line.txt"));
        FilePath blank_line_crlf_file = data_dir.Append(FILE_PATH_LITERAL("blank_line_crlf.txt"));

        EXPECT_TRUE(TextContentsEqual(original_file, same_file));
        EXPECT_TRUE(TextContentsEqual(original_file, crlf_file));
        EXPECT_FALSE(TextContentsEqual(original_file, shortened_file));
        EXPECT_FALSE(TextContentsEqual(original_file, different_file));
        EXPECT_FALSE(TextContentsEqual(original_file, different_first_file));
        EXPECT_FALSE(TextContentsEqual(original_file, different_last_file));
        EXPECT_FALSE(TextContentsEqual(first1_file, first2_file));
        EXPECT_TRUE(TextContentsEqual(empty1_file, empty2_file));
        EXPECT_FALSE(TextContentsEqual(original_file, empty1_file));
        EXPECT_TRUE(TextContentsEqual(blank_line_file, blank_line_crlf_file));
    }

// We don't need equivalent functionality outside of Windows.
#if defined(OS_WIN)
    TEST_F(FileUtilTest, CopyAndDeleteDirectoryTest)
    {
        // Create a directory
        FilePath dir_name_from = temp_dir_.path().Append(FILE_PATH_LITERAL("CopyAndDelete_From_Subdir"));
        CreateDirectory(dir_name_from);
        ASSERT_TRUE(PathExists(dir_name_from));

        // Create a file under the directory
        FilePath file_name_from = dir_name_from.Append(FILE_PATH_LITERAL("CopyAndDelete_Test_File.txt"));
        CreateTextFile(file_name_from, L"Gooooooooooooooooooooogle");
        ASSERT_TRUE(PathExists(file_name_from));

        // Move the directory by using CopyAndDeleteDirectory
        FilePath dir_name_to = temp_dir_.path().Append(
            FILE_PATH_LITERAL("CopyAndDelete_To_Subdir"));
        FilePath file_name_to = dir_name_to.Append(FILE_PATH_LITERAL("CopyAndDelete_Test_File.txt"));

        ASSERT_FALSE(PathExists(dir_name_to));

        EXPECT_TRUE(internal::CopyAndDeleteDirectory(dir_name_from,
            dir_name_to));

        // Check everything has been moved.
        EXPECT_FALSE(PathExists(dir_name_from));
        EXPECT_FALSE(PathExists(file_name_from));
        EXPECT_TRUE(PathExists(dir_name_to));
        EXPECT_TRUE(PathExists(file_name_to));
    }

    TEST_F(FileUtilTest, GetTempDirTest)
    {
        static const TCHAR* kTmpKey = _T("TMP");
        static const TCHAR* kTmpValues[] = {
            _T(""), _T("C:"), _T("C:\\"), _T("C:\\tmp"), _T("C:\\tmp\\")
        };
        // Save the original $TMP.
        size_t original_tmp_size;
        TCHAR* original_tmp;
        ASSERT_EQ(0, ::_tdupenv_s(&original_tmp, &original_tmp_size, kTmpKey));
        // original_tmp may be NULL.

        for (unsigned int i = 0; i < arraysize(kTmpValues); ++i) {
            FilePath path;
            ::_tputenv_s(kTmpKey, kTmpValues[i]);
            GetTempDir(&path);
            EXPECT_TRUE(path.IsAbsolute()) << "$TMP=" << kTmpValues[i] << " result=" << path.value();
        }

        // Restore the original $TMP.
        if (original_tmp) {
            ::_tputenv_s(kTmpKey, original_tmp);
            free(original_tmp);
        } else {
            ::_tputenv_s(kTmpKey, _T(""));
        }
    }

    TEST_F(FileUtilTest, IsOnNetworkDrive)
    {
        struct LocalTestData {
            const FilePath::CharType* input;
            bool expected;
        };

        const LocalTestData local_cases[] = {
            { FPL(""), false },
            { FPL("c:\\"), false },
            { FPL("c:"), false },
            { FPL("c:\\windows\\notepad.exe"), false }
        };

        for (const auto& test_case : local_cases) {
            FilePath input(test_case.input);
            bool observed = IsOnNetworkDrive(input);
            EXPECT_EQ(test_case.expected, observed) << " input: " << input.value();
        }

        std::unique_ptr<Environment> env(Environment::Create());
        // To test IsOnNetworkDrive() for remote cases, set up a file server
        // and place a file called file.txt on the server e.g.
        // \\DC01\TESTSHARE\file.txt
        // then set the two environment variables:
        // set BASE_TEST_FILE_SERVER=DC01
        // set BASE_TEST_FILE_SHARE=TESTSHARE
        if (!env->HasVar("BASE_TEST_FILE_SERVER") || !env->HasVar("BASE_TEST_FILE_SHARE")) {
            return;
        }

        struct NetworkTestData {
            const wchar_t* input;
            bool expected;
        };

        const NetworkTestData network_cases[] = {
            { L"\\\\%BASE_TEST_FILE_SERVER%", false },
            { L"\\\\%BASE_TEST_FILE_SERVER%\\", false },
            { L"\\\\%BASE_TEST_FILE_SERVER%\\file.txt", false },
            { L"\\\\%BASE_TEST_FILE_SERVER%\\%BASE_TEST_FILE_SHARE%", true },
            { L"\\\\%BASE_TEST_FILE_SERVER%\\%BASE_TEST_FILE_SHARE%\\", true },
            { L"\\\\%BASE_TEST_FILE_SERVER%\\%BASE_TEST_FILE_SHARE%\\file.txt", true },
            { L"\\\\%BASE_TEST_FILE_SERVER%\\%BASE_TEST_FILE_SHARE%\\no.txt", false }
        };

        for (const auto& test_case : network_cases) {
            wchar_t path[MAX_PATH] = { 0 };
            ::ExpandEnvironmentStringsW(test_case.input, path, arraysize(path));
            FilePath input(path);
            EXPECT_EQ(test_case.expected, IsOnNetworkDrive(input)) << " input : "
                                                                   << input.value();
        }
    }
#endif // OS_WIN

    TEST_F(FileUtilTest, CreateTemporaryFileTest)
    {
        FilePath temp_files[3];
        for (int i = 0; i < 3; i++) {
            ASSERT_TRUE(CreateTemporaryFile(&(temp_files[i])));
            EXPECT_TRUE(PathExists(temp_files[i]));
            EXPECT_FALSE(DirectoryExists(temp_files[i]));
        }
        for (int i = 0; i < 3; i++)
            EXPECT_FALSE(temp_files[i] == temp_files[(i + 1) % 3]);
        for (int i = 0; i < 3; i++)
            EXPECT_TRUE(DeleteFile(temp_files[i], false));
    }

    TEST_F(FileUtilTest, CreateAndOpenTemporaryFileTest)
    {
        FilePath names[3];
        FILE* fps[3];
        int i;

        // Create; make sure they are open and exist.
        for (i = 0; i < 3; ++i) {
            fps[i] = CreateAndOpenTemporaryFile(&(names[i]));
            ASSERT_TRUE(fps[i]);
            EXPECT_TRUE(PathExists(names[i]));
        }

        // Make sure all names are unique.
        for (i = 0; i < 3; ++i) {
            EXPECT_FALSE(names[i] == names[(i + 1) % 3]);
        }

        // Close and delete.
        for (i = 0; i < 3; ++i) {
            EXPECT_TRUE(CloseFile(fps[i]));
            EXPECT_TRUE(DeleteFile(names[i], false));
        }
    }

    TEST_F(FileUtilTest, FileToFILE)
    {
        File file;
        FILE* stream = FileToFILE(std::move(file), "w");
        EXPECT_FALSE(stream);

        FilePath file_name = temp_dir_.path().Append(FPL("The file.txt"));
        file = File(file_name, File::FLAG_CREATE | File::FLAG_WRITE);
        EXPECT_TRUE(file.IsValid());

        stream = FileToFILE(std::move(file), "w");
        EXPECT_TRUE(stream);
        EXPECT_FALSE(file.IsValid());
        EXPECT_TRUE(CloseFile(stream));
    }

    TEST_F(FileUtilTest, CreateNewTempDirectoryTest)
    {
        FilePath temp_dir;
        ASSERT_TRUE(CreateNewTempDirectory(FilePath::StringType(), &temp_dir));
        EXPECT_TRUE(PathExists(temp_dir));
        EXPECT_TRUE(DeleteFile(temp_dir, false));
    }

    TEST_F(FileUtilTest, CreateNewTemporaryDirInDirTest)
    {
        FilePath new_dir;
        ASSERT_TRUE(CreateTemporaryDirInDir(
            temp_dir_.path(),
            FILE_PATH_LITERAL("CreateNewTemporaryDirInDirTest"),
            &new_dir));
        EXPECT_TRUE(PathExists(new_dir));
        EXPECT_TRUE(temp_dir_.path().IsParent(new_dir));
        EXPECT_TRUE(DeleteFile(new_dir, false));
    }

#if defined(OS_POSIX)
    TEST_F(FileUtilTest, GetShmemTempDirTest)
    {
        FilePath dir;
        EXPECT_TRUE(GetShmemTempDir(false, &dir));
        EXPECT_TRUE(DirectoryExists(dir));
    }
#endif

    TEST_F(FileUtilTest, GetHomeDirTest)
    {
#if !defined(OS_ANDROID) // Not implemented on Android.
        // We don't actually know what the home directory is supposed to be without
        // calling some OS functions which would just duplicate the implementation.
        // So here we just test that it returns something "reasonable".
        FilePath home = GetHomeDir();
        ASSERT_FALSE(home.empty());
        ASSERT_TRUE(home.IsAbsolute());
#endif
    }

    TEST_F(FileUtilTest, CreateDirectoryTest)
    {
        FilePath test_root = temp_dir_.path().Append(FILE_PATH_LITERAL("create_directory_test"));
#if defined(OS_WIN)
        FilePath test_path = test_root.Append(FILE_PATH_LITERAL("dir\\tree\\likely\\doesnt\\exist\\"));
#elif defined(OS_POSIX)
        FilePath test_path = test_root.Append(FILE_PATH_LITERAL("dir/tree/likely/doesnt/exist/"));
#endif

        EXPECT_FALSE(PathExists(test_path));
        EXPECT_TRUE(CreateDirectory(test_path));
        EXPECT_TRUE(PathExists(test_path));
        // CreateDirectory returns true if the DirectoryExists returns true.
        EXPECT_TRUE(CreateDirectory(test_path));

        // Doesn't work to create it on top of a non-dir
        test_path = test_path.Append(FILE_PATH_LITERAL("foobar.txt"));
        EXPECT_FALSE(PathExists(test_path));
        CreateTextFile(test_path, L"test file");
        EXPECT_TRUE(PathExists(test_path));
        EXPECT_FALSE(CreateDirectory(test_path));

        EXPECT_TRUE(DeleteFile(test_root, true));
        EXPECT_FALSE(PathExists(test_root));
        EXPECT_FALSE(PathExists(test_path));

        // Verify assumptions made by the Windows implementation:
        // 1. The current directory always exists.
        // 2. The root directory always exists.
        ASSERT_TRUE(DirectoryExists(FilePath(FilePath::kCurrentDirectory)));
        FilePath top_level = test_root;
        while (top_level != top_level.DirName()) {
            top_level = top_level.DirName();
        }
        ASSERT_TRUE(DirectoryExists(top_level));

        // Given these assumptions hold, it should be safe to
        // test that "creating" these directories succeeds.
        EXPECT_TRUE(CreateDirectory(
            FilePath(FilePath::kCurrentDirectory)));
        EXPECT_TRUE(CreateDirectory(top_level));

#if defined(OS_WIN)
        FilePath invalid_drive(FILE_PATH_LITERAL("o:\\"));
        FilePath invalid_path = invalid_drive.Append(FILE_PATH_LITERAL("some\\inaccessible\\dir"));
        if (!PathExists(invalid_drive)) {
            EXPECT_FALSE(CreateDirectory(invalid_path));
        }
#endif
    }

    TEST_F(FileUtilTest, DetectDirectoryTest)
    {
        // Check a directory
        FilePath test_root = temp_dir_.path().Append(FILE_PATH_LITERAL("detect_directory_test"));
        EXPECT_FALSE(PathExists(test_root));
        EXPECT_TRUE(CreateDirectory(test_root));
        EXPECT_TRUE(PathExists(test_root));
        EXPECT_TRUE(DirectoryExists(test_root));
        // Check a file
        FilePath test_path = test_root.Append(FILE_PATH_LITERAL("foobar.txt"));
        EXPECT_FALSE(PathExists(test_path));
        CreateTextFile(test_path, L"test file");
        EXPECT_TRUE(PathExists(test_path));
        EXPECT_FALSE(DirectoryExists(test_path));
        EXPECT_TRUE(DeleteFile(test_path, false));

        EXPECT_TRUE(DeleteFile(test_root, true));
    }

    TEST_F(FileUtilTest, FileEnumeratorTest)
    {
        // Test an empty directory.
        FileEnumerator f0(temp_dir_.path(), true, FILES_AND_DIRECTORIES);
        EXPECT_EQ(FPL(""), f0.Next().value());
        EXPECT_EQ(FPL(""), f0.Next().value());

        // Test an empty directory, non-recursively, including "..".
        FileEnumerator f0_dotdot(temp_dir_.path(), false,
            FILES_AND_DIRECTORIES | FileEnumerator::INCLUDE_DOT_DOT);
        EXPECT_EQ(temp_dir_.path().Append(FPL("..")).value(),
            f0_dotdot.Next().value());
        EXPECT_EQ(FPL(""), f0_dotdot.Next().value());

        // create the directories
        FilePath dir1 = temp_dir_.path().Append(FPL("dir1"));
        EXPECT_TRUE(CreateDirectory(dir1));
        FilePath dir2 = temp_dir_.path().Append(FPL("dir2"));
        EXPECT_TRUE(CreateDirectory(dir2));
        FilePath dir2inner = dir2.Append(FPL("inner"));
        EXPECT_TRUE(CreateDirectory(dir2inner));

        // create the files
        FilePath dir2file = dir2.Append(FPL("dir2file.txt"));
        CreateTextFile(dir2file, std::wstring());
        FilePath dir2innerfile = dir2inner.Append(FPL("innerfile.txt"));
        CreateTextFile(dir2innerfile, std::wstring());
        FilePath file1 = temp_dir_.path().Append(FPL("file1.txt"));
        CreateTextFile(file1, std::wstring());
        FilePath file2_rel = dir2.Append(FilePath::kParentDirectory)
                                 .Append(FPL("file2.txt"));
        CreateTextFile(file2_rel, std::wstring());
        FilePath file2_abs = temp_dir_.path().Append(FPL("file2.txt"));

        // Only enumerate files.
        FileEnumerator f1(temp_dir_.path(), true, FileEnumerator::FILES);
        FindResultCollector c1(&f1);
        EXPECT_TRUE(c1.HasFile(file1));
        EXPECT_TRUE(c1.HasFile(file2_abs));
        EXPECT_TRUE(c1.HasFile(dir2file));
        EXPECT_TRUE(c1.HasFile(dir2innerfile));
        EXPECT_EQ(4, c1.size());

        // Only enumerate directories.
        FileEnumerator f2(temp_dir_.path(), true, FileEnumerator::DIRECTORIES);
        FindResultCollector c2(&f2);
        EXPECT_TRUE(c2.HasFile(dir1));
        EXPECT_TRUE(c2.HasFile(dir2));
        EXPECT_TRUE(c2.HasFile(dir2inner));
        EXPECT_EQ(3, c2.size());

        // Only enumerate directories non-recursively.
        FileEnumerator f2_non_recursive(
            temp_dir_.path(), false, FileEnumerator::DIRECTORIES);
        FindResultCollector c2_non_recursive(&f2_non_recursive);
        EXPECT_TRUE(c2_non_recursive.HasFile(dir1));
        EXPECT_TRUE(c2_non_recursive.HasFile(dir2));
        EXPECT_EQ(2, c2_non_recursive.size());

        // Only enumerate directories, non-recursively, including "..".
        FileEnumerator f2_dotdot(temp_dir_.path(), false,
            FileEnumerator::DIRECTORIES | FileEnumerator::INCLUDE_DOT_DOT);
        FindResultCollector c2_dotdot(&f2_dotdot);
        EXPECT_TRUE(c2_dotdot.HasFile(dir1));
        EXPECT_TRUE(c2_dotdot.HasFile(dir2));
        EXPECT_TRUE(c2_dotdot.HasFile(temp_dir_.path().Append(FPL(".."))));
        EXPECT_EQ(3, c2_dotdot.size());

        // Enumerate files and directories.
        FileEnumerator f3(temp_dir_.path(), true, FILES_AND_DIRECTORIES);
        FindResultCollector c3(&f3);
        EXPECT_TRUE(c3.HasFile(dir1));
        EXPECT_TRUE(c3.HasFile(dir2));
        EXPECT_TRUE(c3.HasFile(file1));
        EXPECT_TRUE(c3.HasFile(file2_abs));
        EXPECT_TRUE(c3.HasFile(dir2file));
        EXPECT_TRUE(c3.HasFile(dir2inner));
        EXPECT_TRUE(c3.HasFile(dir2innerfile));
        EXPECT_EQ(7, c3.size());

        // Non-recursive operation.
        FileEnumerator f4(temp_dir_.path(), false, FILES_AND_DIRECTORIES);
        FindResultCollector c4(&f4);
        EXPECT_TRUE(c4.HasFile(dir2));
        EXPECT_TRUE(c4.HasFile(dir2));
        EXPECT_TRUE(c4.HasFile(file1));
        EXPECT_TRUE(c4.HasFile(file2_abs));
        EXPECT_EQ(4, c4.size());

        // Enumerate with a pattern.
        FileEnumerator f5(temp_dir_.path(), true, FILES_AND_DIRECTORIES, FPL("dir*"));
        FindResultCollector c5(&f5);
        EXPECT_TRUE(c5.HasFile(dir1));
        EXPECT_TRUE(c5.HasFile(dir2));
        EXPECT_TRUE(c5.HasFile(dir2file));
        EXPECT_TRUE(c5.HasFile(dir2inner));
        EXPECT_TRUE(c5.HasFile(dir2innerfile));
        EXPECT_EQ(5, c5.size());

#if defined(OS_WIN)
        {
            // Make dir1 point to dir2.
            ReparsePoint reparse_point(dir1, dir2);
            EXPECT_TRUE(reparse_point.IsValid());

            if ((win::GetVersion() >= win::VERSION_VISTA)) {
                // There can be a delay for the enumeration code to see the change on
                // the file system so skip this test for XP.
                // Enumerate the reparse point.
                FileEnumerator f6(dir1, true, FILES_AND_DIRECTORIES);
                FindResultCollector c6(&f6);
                FilePath inner2 = dir1.Append(FPL("inner"));
                EXPECT_TRUE(c6.HasFile(inner2));
                EXPECT_TRUE(c6.HasFile(inner2.Append(FPL("innerfile.txt"))));
                EXPECT_TRUE(c6.HasFile(dir1.Append(FPL("dir2file.txt"))));
                EXPECT_EQ(3, c6.size());
            }

            // No changes for non recursive operation.
            FileEnumerator f7(temp_dir_.path(), false, FILES_AND_DIRECTORIES);
            FindResultCollector c7(&f7);
            EXPECT_TRUE(c7.HasFile(dir2));
            EXPECT_TRUE(c7.HasFile(dir2));
            EXPECT_TRUE(c7.HasFile(file1));
            EXPECT_TRUE(c7.HasFile(file2_abs));
            EXPECT_EQ(4, c7.size());

            // Should not enumerate inside dir1 when using recursion.
            FileEnumerator f8(temp_dir_.path(), true, FILES_AND_DIRECTORIES);
            FindResultCollector c8(&f8);
            EXPECT_TRUE(c8.HasFile(dir1));
            EXPECT_TRUE(c8.HasFile(dir2));
            EXPECT_TRUE(c8.HasFile(file1));
            EXPECT_TRUE(c8.HasFile(file2_abs));
            EXPECT_TRUE(c8.HasFile(dir2file));
            EXPECT_TRUE(c8.HasFile(dir2inner));
            EXPECT_TRUE(c8.HasFile(dir2innerfile));
            EXPECT_EQ(7, c8.size());
        }
#endif

        // Make sure the destructor closes the find handle while in the middle of a
        // query to allow TearDown to delete the directory.
        FileEnumerator f9(temp_dir_.path(), true, FILES_AND_DIRECTORIES);
        EXPECT_FALSE(f9.Next().value().empty()); // Should have found something
            // (we don't care what).
    }

    TEST_F(FileUtilTest, AppendToFile)
    {
        FilePath data_dir = temp_dir_.path().Append(FILE_PATH_LITERAL("FilePathTest"));

        // Create a fresh, empty copy of this directory.
        if (PathExists(data_dir)) {
            ASSERT_TRUE(DeleteFile(data_dir, true));
        }
        ASSERT_TRUE(CreateDirectory(data_dir));

        // Create a fresh, empty copy of this directory.
        if (PathExists(data_dir)) {
            ASSERT_TRUE(DeleteFile(data_dir, true));
        }
        ASSERT_TRUE(CreateDirectory(data_dir));
        FilePath foobar(data_dir.Append(FILE_PATH_LITERAL("foobar.txt")));

        std::string data("hello");
        EXPECT_FALSE(AppendToFile(foobar, data.c_str(), data.size()));
        EXPECT_EQ(static_cast<int>(data.length()),
            WriteFile(foobar, data.c_str(), data.length()));
        EXPECT_TRUE(AppendToFile(foobar, data.c_str(), data.size()));

        const std::wstring read_content = ReadTextFile(foobar);
        EXPECT_EQ(L"hellohello", read_content);
    }

    TEST_F(FileUtilTest, ReadFile)
    {
        // Create a test file to be read.
        const std::string kTestData("The quick brown fox jumps over the lazy dog.");
        FilePath file_path = temp_dir_.path().Append(FILE_PATH_LITERAL("ReadFileTest"));

        ASSERT_EQ(static_cast<int>(kTestData.size()),
            WriteFile(file_path, kTestData.data(), kTestData.size()));

        // Make buffers with various size.
        std::vector<char> small_buffer(kTestData.size() / 2);
        std::vector<char> exact_buffer(kTestData.size());
        std::vector<char> large_buffer(kTestData.size() * 2);

        // Read the file with smaller buffer.
        int bytes_read_small = ReadFile(
            file_path, &small_buffer[0], static_cast<int>(small_buffer.size()));
        EXPECT_EQ(static_cast<int>(small_buffer.size()), bytes_read_small);
        EXPECT_EQ(
            std::string(kTestData.begin(), kTestData.begin() + small_buffer.size()),
            std::string(small_buffer.begin(), small_buffer.end()));

        // Read the file with buffer which have exactly same size.
        int bytes_read_exact = ReadFile(
            file_path, &exact_buffer[0], static_cast<int>(exact_buffer.size()));
        EXPECT_EQ(static_cast<int>(kTestData.size()), bytes_read_exact);
        EXPECT_EQ(kTestData, std::string(exact_buffer.begin(), exact_buffer.end()));

        // Read the file with larger buffer.
        int bytes_read_large = ReadFile(
            file_path, &large_buffer[0], static_cast<int>(large_buffer.size()));
        EXPECT_EQ(static_cast<int>(kTestData.size()), bytes_read_large);
        EXPECT_EQ(kTestData, std::string(large_buffer.begin(), large_buffer.begin() + kTestData.size()));

        // Make sure the return value is -1 if the file doesn't exist.
        FilePath file_path_not_exist = temp_dir_.path().Append(FILE_PATH_LITERAL("ReadFileNotExistTest"));
        EXPECT_EQ(-1,
            ReadFile(file_path_not_exist,
                &exact_buffer[0],
                static_cast<int>(exact_buffer.size())));
    }

    TEST_F(FileUtilTest, ReadFileToString)
    {
        const char kTestData[] = "0123";
        std::string data;

        FilePath file_path = temp_dir_.path().Append(FILE_PATH_LITERAL("ReadFileToStringTest"));
        FilePath file_path_dangerous = temp_dir_.path().Append(FILE_PATH_LITERAL("..")).Append(temp_dir_.path().BaseName()).Append(FILE_PATH_LITERAL("ReadFileToStringTest"));

        // Create test file.
        ASSERT_EQ(4, WriteFile(file_path, kTestData, 4));

        EXPECT_TRUE(ReadFileToString(file_path, &data));
        EXPECT_EQ(kTestData, data);

        data = "temp";
        EXPECT_FALSE(ReadFileToStringWithMaxSize(file_path, &data, 0));
        EXPECT_EQ(0u, data.length());

        data = "temp";
        EXPECT_FALSE(ReadFileToStringWithMaxSize(file_path, &data, 2));
        EXPECT_EQ("01", data);

        data.clear();
        EXPECT_FALSE(ReadFileToStringWithMaxSize(file_path, &data, 3));
        EXPECT_EQ("012", data);

        data.clear();
        EXPECT_TRUE(ReadFileToStringWithMaxSize(file_path, &data, 4));
        EXPECT_EQ("0123", data);

        data.clear();
        EXPECT_TRUE(ReadFileToStringWithMaxSize(file_path, &data, 6));
        EXPECT_EQ("0123", data);

        EXPECT_TRUE(ReadFileToStringWithMaxSize(file_path, NULL, 6));

        EXPECT_TRUE(ReadFileToString(file_path, NULL));

        data = "temp";
        EXPECT_FALSE(ReadFileToString(file_path_dangerous, &data));
        EXPECT_EQ(0u, data.length());

        // Delete test file.
        EXPECT_TRUE(DeleteFile(file_path, false));

        data = "temp";
        EXPECT_FALSE(ReadFileToString(file_path, &data));
        EXPECT_EQ(0u, data.length());

        data = "temp";
        EXPECT_FALSE(ReadFileToStringWithMaxSize(file_path, &data, 6));
        EXPECT_EQ(0u, data.length());
    }

    TEST_F(FileUtilTest, TouchFile)
    {
        FilePath data_dir = temp_dir_.path().Append(FILE_PATH_LITERAL("FilePathTest"));

        // Create a fresh, empty copy of this directory.
        if (PathExists(data_dir)) {
            ASSERT_TRUE(DeleteFile(data_dir, true));
        }
        ASSERT_TRUE(CreateDirectory(data_dir));

        FilePath foobar(data_dir.Append(FILE_PATH_LITERAL("foobar.txt")));
        std::string data("hello");
        ASSERT_TRUE(WriteFile(foobar, data.c_str(), data.length()));

        Time access_time;
        // This timestamp is divisible by one day (in local timezone),
        // to make it work on FAT too.
        ASSERT_TRUE(Time::FromString("Wed, 16 Nov 1994, 00:00:00",
            &access_time));

        Time modification_time;
        // Note that this timestamp is divisible by two (seconds) - FAT stores
        // modification times with 2s resolution.
        ASSERT_TRUE(Time::FromString("Tue, 15 Nov 1994, 12:45:26 GMT",
            &modification_time));

        ASSERT_TRUE(TouchFile(foobar, access_time, modification_time));
        File::Info file_info;
        ASSERT_TRUE(GetFileInfo(foobar, &file_info));
        EXPECT_EQ(access_time.ToInternalValue(),
            file_info.last_accessed.ToInternalValue());
        EXPECT_EQ(modification_time.ToInternalValue(),
            file_info.last_modified.ToInternalValue());
    }

    TEST_F(FileUtilTest, IsDirectoryEmpty)
    {
        FilePath empty_dir = temp_dir_.path().Append(FILE_PATH_LITERAL("EmptyDir"));

        ASSERT_FALSE(PathExists(empty_dir));

        ASSERT_TRUE(CreateDirectory(empty_dir));

        EXPECT_TRUE(IsDirectoryEmpty(empty_dir));

        FilePath foo(empty_dir.Append(FILE_PATH_LITERAL("foo.txt")));
        std::string bar("baz");
        ASSERT_TRUE(WriteFile(foo, bar.c_str(), bar.length()));

        EXPECT_FALSE(IsDirectoryEmpty(empty_dir));
    }

#if defined(OS_POSIX)

    // Testing VerifyPathControlledByAdmin() is hard, because there is no
    // way a test can make a file owned by root, or change file paths
    // at the root of the file system.  VerifyPathControlledByAdmin()
    // is implemented as a call to VerifyPathControlledByUser, which gives
    // us the ability to test with paths under the test's temp directory,
    // using a user id we control.
    // Pull tests of VerifyPathControlledByUserTest() into a separate test class
    // with a common SetUp() method.
    class VerifyPathControlledByUserTest : public FileUtilTest {
    protected:
        void SetUp() override
        {
            FileUtilTest::SetUp();

            // Create a basic structure used by each test.
            // base_dir_
            //  |-> sub_dir_
            //       |-> text_file_

            base_dir_ = temp_dir_.path().AppendASCII("base_dir");
            ASSERT_TRUE(CreateDirectory(base_dir_));

            sub_dir_ = base_dir_.AppendASCII("sub_dir");
            ASSERT_TRUE(CreateDirectory(sub_dir_));

            text_file_ = sub_dir_.AppendASCII("file.txt");
            CreateTextFile(text_file_, L"This text file has some text in it.");

            // Get the user and group files are created with from |base_dir_|.
            struct stat stat_buf;
            ASSERT_EQ(0, stat(base_dir_.value().c_str(), &stat_buf));
            uid_ = stat_buf.st_uid;
            ok_gids_.insert(stat_buf.st_gid);
            bad_gids_.insert(stat_buf.st_gid + 1);

            ASSERT_EQ(uid_, getuid()); // This process should be the owner.

            // To ensure that umask settings do not cause the initial state
            // of permissions to be different from what we expect, explicitly
            // set permissions on the directories we create.
            // Make all files and directories non-world-writable.

            // Users and group can read, write, traverse
            int enabled_permissions = FILE_PERMISSION_USER_MASK | FILE_PERMISSION_GROUP_MASK;
            // Other users can't read, write, traverse
            int disabled_permissions = FILE_PERMISSION_OTHERS_MASK;

            ASSERT_NO_FATAL_FAILURE(
                ChangePosixFilePermissions(
                    base_dir_, enabled_permissions, disabled_permissions));
            ASSERT_NO_FATAL_FAILURE(
                ChangePosixFilePermissions(
                    sub_dir_, enabled_permissions, disabled_permissions));
        }

        FilePath base_dir_;
        FilePath sub_dir_;
        FilePath text_file_;
        uid_t uid_;

        std::set<gid_t> ok_gids_;
        std::set<gid_t> bad_gids_;
    };

    TEST_F(VerifyPathControlledByUserTest, BadPaths)
    {
        // File does not exist.
        FilePath does_not_exist = base_dir_.AppendASCII("does")
                                      .AppendASCII("not")
                                      .AppendASCII("exist");
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, does_not_exist, uid_, ok_gids_));

        // |base| not a subpath of |path|.
        EXPECT_FALSE(VerifyPathControlledByUser(sub_dir_, base_dir_, uid_, ok_gids_));

        // An empty base path will fail to be a prefix for any path.
        FilePath empty;
        EXPECT_FALSE(VerifyPathControlledByUser(empty, base_dir_, uid_, ok_gids_));

        // Finding that a bad call fails proves nothing unless a good call succeeds.
        EXPECT_TRUE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
    }

    TEST_F(VerifyPathControlledByUserTest, Symlinks)
    {
        // Symlinks in the path should cause failure.

        // Symlink to the file at the end of the path.
        FilePath file_link = base_dir_.AppendASCII("file_link");
        ASSERT_TRUE(CreateSymbolicLink(text_file_, file_link))
            << "Failed to create symlink.";

        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, file_link, uid_, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(file_link, file_link, uid_, ok_gids_));

        // Symlink from one directory to another within the path.
        FilePath link_to_sub_dir = base_dir_.AppendASCII("link_to_sub_dir");
        ASSERT_TRUE(CreateSymbolicLink(sub_dir_, link_to_sub_dir))
            << "Failed to create symlink.";

        FilePath file_path_with_link = link_to_sub_dir.AppendASCII("file.txt");
        ASSERT_TRUE(PathExists(file_path_with_link));

        EXPECT_FALSE(VerifyPathControlledByUser(base_dir_, file_path_with_link, uid_,
            ok_gids_));

        EXPECT_FALSE(VerifyPathControlledByUser(link_to_sub_dir, file_path_with_link,
            uid_, ok_gids_));

        // Symlinks in parents of base path are allowed.
        EXPECT_TRUE(VerifyPathControlledByUser(file_path_with_link,
            file_path_with_link, uid_, ok_gids_));
    }

    TEST_F(VerifyPathControlledByUserTest, OwnershipChecks)
    {
        // Get a uid that is not the uid of files we create.
        uid_t bad_uid = uid_ + 1;

        // Make all files and directories non-world-writable.
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(base_dir_, 0u, S_IWOTH));
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(sub_dir_, 0u, S_IWOTH));
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(text_file_, 0u, S_IWOTH));

        // We control these paths.
        EXPECT_TRUE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
        EXPECT_TRUE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, ok_gids_));
        EXPECT_TRUE(VerifyPathControlledByUser(sub_dir_, text_file_, uid_, ok_gids_));

        // Another user does not control these paths.
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, sub_dir_, bad_uid, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, text_file_, bad_uid, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(sub_dir_, text_file_, bad_uid, ok_gids_));

        // Another group does not control the paths.
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, bad_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, bad_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(sub_dir_, text_file_, uid_, bad_gids_));
    }

    TEST_F(VerifyPathControlledByUserTest, GroupWriteTest)
    {
        // Make all files and directories writable only by their owner.
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(base_dir_, 0u, S_IWOTH | S_IWGRP));
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(sub_dir_, 0u, S_IWOTH | S_IWGRP));
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(text_file_, 0u, S_IWOTH | S_IWGRP));

        // Any group is okay because the path is not group-writable.
        EXPECT_TRUE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
        EXPECT_TRUE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, ok_gids_));
        EXPECT_TRUE(VerifyPathControlledByUser(sub_dir_, text_file_, uid_, ok_gids_));

        EXPECT_TRUE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, bad_gids_));
        EXPECT_TRUE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, bad_gids_));
        EXPECT_TRUE(
            VerifyPathControlledByUser(sub_dir_, text_file_, uid_, bad_gids_));

        // No group is okay, because we don't check the group
        // if no group can write.
        std::set<gid_t> no_gids; // Empty set of gids.
        EXPECT_TRUE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, no_gids));
        EXPECT_TRUE(VerifyPathControlledByUser(base_dir_, text_file_, uid_, no_gids));
        EXPECT_TRUE(VerifyPathControlledByUser(sub_dir_, text_file_, uid_, no_gids));

        // Make all files and directories writable by their group.
        ASSERT_NO_FATAL_FAILURE(ChangePosixFilePermissions(base_dir_, S_IWGRP, 0u));
        ASSERT_NO_FATAL_FAILURE(ChangePosixFilePermissions(sub_dir_, S_IWGRP, 0u));
        ASSERT_NO_FATAL_FAILURE(ChangePosixFilePermissions(text_file_, S_IWGRP, 0u));

        // Now |ok_gids_| works, but |bad_gids_| fails.
        EXPECT_TRUE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
        EXPECT_TRUE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, ok_gids_));
        EXPECT_TRUE(VerifyPathControlledByUser(sub_dir_, text_file_, uid_, ok_gids_));

        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, bad_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, bad_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(sub_dir_, text_file_, uid_, bad_gids_));

        // Because any group in the group set is allowed,
        // the union of good and bad gids passes.

        std::set<gid_t> multiple_gids;
        std::set_union(
            ok_gids_.begin(), ok_gids_.end(),
            bad_gids_.begin(), bad_gids_.end(),
            std::inserter(multiple_gids, multiple_gids.begin()));

        EXPECT_TRUE(
            VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, multiple_gids));
        EXPECT_TRUE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, multiple_gids));
        EXPECT_TRUE(
            VerifyPathControlledByUser(sub_dir_, text_file_, uid_, multiple_gids));
    }

    TEST_F(VerifyPathControlledByUserTest, WriteBitChecks)
    {
        // Make all files and directories non-world-writable.
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(base_dir_, 0u, S_IWOTH));
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(sub_dir_, 0u, S_IWOTH));
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(text_file_, 0u, S_IWOTH));

        // Initialy, we control all parts of the path.
        EXPECT_TRUE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
        EXPECT_TRUE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, ok_gids_));
        EXPECT_TRUE(VerifyPathControlledByUser(sub_dir_, text_file_, uid_, ok_gids_));

        // Make base_dir_ world-writable.
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(base_dir_, S_IWOTH, 0u));
        EXPECT_FALSE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, ok_gids_));
        EXPECT_TRUE(VerifyPathControlledByUser(sub_dir_, text_file_, uid_, ok_gids_));

        // Make sub_dir_ world writable.
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(sub_dir_, S_IWOTH, 0u));
        EXPECT_FALSE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(sub_dir_, text_file_, uid_, ok_gids_));

        // Make text_file_ world writable.
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(text_file_, S_IWOTH, 0u));
        EXPECT_FALSE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(sub_dir_, text_file_, uid_, ok_gids_));

        // Make sub_dir_ non-world writable.
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(sub_dir_, 0u, S_IWOTH));
        EXPECT_FALSE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(sub_dir_, text_file_, uid_, ok_gids_));

        // Make base_dir_ non-world-writable.
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(base_dir_, 0u, S_IWOTH));
        EXPECT_TRUE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, ok_gids_));
        EXPECT_FALSE(
            VerifyPathControlledByUser(sub_dir_, text_file_, uid_, ok_gids_));

        // Back to the initial state: Nothing is writable, so every path
        // should pass.
        ASSERT_NO_FATAL_FAILURE(
            ChangePosixFilePermissions(text_file_, 0u, S_IWOTH));
        EXPECT_TRUE(VerifyPathControlledByUser(base_dir_, sub_dir_, uid_, ok_gids_));
        EXPECT_TRUE(
            VerifyPathControlledByUser(base_dir_, text_file_, uid_, ok_gids_));
        EXPECT_TRUE(VerifyPathControlledByUser(sub_dir_, text_file_, uid_, ok_gids_));
    }

#if defined(OS_ANDROID)
    TEST_F(FileUtilTest, ValidContentUriTest)
    {
        // Get the test image path.
        FilePath data_dir;
        ASSERT_TRUE(PathService::Get(DIR_TEST_DATA, &data_dir));
        data_dir = data_dir.AppendASCII("file_util");
        ASSERT_TRUE(PathExists(data_dir));
        FilePath image_file = data_dir.Append(FILE_PATH_LITERAL("red.png"));
        int64_t image_size;
        GetFileSize(image_file, &image_size);
        EXPECT_LT(0, image_size);

        // Insert the image into MediaStore. MediaStore will do some conversions, and
        // return the content URI.
        FilePath path = InsertImageIntoMediaStore(image_file);
        EXPECT_TRUE(path.IsContentUri());
        EXPECT_TRUE(PathExists(path));
        // The file size may not equal to the input image as MediaStore may convert
        // the image.
        int64_t content_uri_size;
        GetFileSize(path, &content_uri_size);
        EXPECT_EQ(image_size, content_uri_size);

        // We should be able to read the file.
        char* buffer = new char[image_size];
        File file = OpenContentUriForRead(path);
        EXPECT_TRUE(file.IsValid());
        EXPECT_TRUE(file.ReadAtCurrentPos(buffer, image_size));
        delete[] buffer;
    }

    TEST_F(FileUtilTest, NonExistentContentUriTest)
    {
        FilePath path("content://foo.bar");
        EXPECT_TRUE(path.IsContentUri());
        EXPECT_FALSE(PathExists(path));
        // Size should be smaller than 0.
        int64_t size;
        EXPECT_FALSE(GetFileSize(path, &size));

        // We should not be able to read the file.
        File file = OpenContentUriForRead(path);
        EXPECT_FALSE(file.IsValid());
    }
#endif

    TEST(ScopedFD, ScopedFDDoesClose)
    {
        int fds[2];
        char c = 0;
        ASSERT_EQ(0, pipe(fds));
        const int write_end = fds[1];
        ScopedFD read_end_closer(fds[0]);
        {
            ScopedFD write_end_closer(fds[1]);
        }
        // This is the only thread. This file descriptor should no longer be valid.
        int ret = close(write_end);
        EXPECT_EQ(-1, ret);
        EXPECT_EQ(EBADF, errno);
        // Make sure read(2) won't block.
        ASSERT_EQ(0, fcntl(fds[0], F_SETFL, O_NONBLOCK));
        // Reading the pipe should EOF.
        EXPECT_EQ(0, read(fds[0], &c, 1));
    }

#if defined(GTEST_HAS_DEATH_TEST)
    void CloseWithScopedFD(int fd)
    {
        ScopedFD fd_closer(fd);
    }
#endif

    TEST(ScopedFD, ScopedFDCrashesOnCloseFailure)
    {
        int fds[2];
        ASSERT_EQ(0, pipe(fds));
        ScopedFD read_end_closer(fds[0]);
        EXPECT_EQ(0, IGNORE_EINTR(close(fds[1])));
#if defined(GTEST_HAS_DEATH_TEST)
        // This is the only thread. This file descriptor should no longer be valid.
        // Trying to close it should crash. This is important for security.
        EXPECT_DEATH(CloseWithScopedFD(fds[1]), "");
#endif
    }

#endif // defined(OS_POSIX)

} // namespace

} // namespace base
